MCQs / Engineering Reviewer - Electricity and Magnetism Fundamentals Part 6

<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td style="text-align: center;"><a href="http://2.bp.blogspot.com/-QgDtnOlr1A0/VQunJ9xUFPI/AAAAAAAABI8/prZSaus1tso/s1600/mcqs-electricty-magnetism.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="MCQs on Electricity and Magnetism Fundamentals" border="0" src="http://2.bp.blogspot.com/-QgDtnOlr1A0/VQunJ9xUFPI/AAAAAAAABI8/prZSaus1tso/s1600/mcqs-electricty-magnetism.jpg" title="MCQs on Electricity and Magnetism Fundamentals" /></a></td></tr> <tr><td class="tr-caption" style="text-align: center;"><span style="font-size: 12.8000001907349px;">Engineering Reviewer - Electricity and Magnetism Fundamentals</span></td></tr> </tbody></table> <b>Multiple Choice Questions</b><br /> <b>Electricity and Magnetism Fundamentals</b><br /> <br /> 251. The relation between absolute permittivity of air (ε0), absolute permeability of air (μ0) and velocity of light (c) is given by<br /> A. μ0ε0 = c^2<br /> B. μ0ε0 = c<br /> C. 1/μ0ε0 = c<br /> D. 1/μ0ε0 = c^2<br /> <br /> 252. The dielectric constant of most materials lies between<br /> A. 1 and 10<br /> B. 10 and 20<br /> C. 20 and 50<br /> D. 50 and 100<br /> <br /> 253. A test charge means a charge of<br /> A. -1 C<br /> B. 1 electron<br /> C. +1 C<br /> D. -20 C<br /> <br /> 254. Electric lines of force leave or enter the charge surface at an angle of<br /> A. 30̊<br /> B. 45̊<br /> C. 90̊<br /> D. depending upon the angle of launch and entry<br /> <br /> 255. Electric field intensity is measured in<br /> A. volts/meter<br /> B. Newton/meter<br /> C. Newton-meter<br /> D. Amperes/meter<br /> <br /> 256. Electric field intensity is a ________.<br /> A. scalar<br /> B. phasor<br /> C. vector<br /> D. variable<br /> <br /> 257. Electric field intensity at a point due to a given charge ______ if the relative permittivity of the medium decreases.<br /> A. decreases<br /> B. remains unchanged<br /> C. increases<br /> D. becomes zero<br /> <br /> 258. The electric field intensity between the parallel plate air capacitor is 20 N/C. If an insulating slab of relative permittivity 5 is placed between the plates, then electric field intensity will be<br /> A. 20 N/C<br /> B. 100 N/C<br /> C. 4 N/C<br /> D. 40 N/C<br /> <br /> 259. The electric flux density is a ________ quantity.<br /> A. phasor<br /> B. vector<br /> C. scalar<br /> D. variable<br /> <br /> 260. The permittivity of a material is given by one of the following formulas.<br /> A. DE<br /> B. E/D<br /> C. D^2/E<br /> D. D/E<br /> <br /> 261. Electric field intensity at a point is numerically equal to ________ at that point.<br /> A. potential gradient<br /> B. potential difference<br /> C. dielectric constant<br /> D. the force<br /> <br /> 262. Three charges of +5 C, -6 C and +9 C are placed inside a sphere. What is the total flux passing through the surface of sphere?<br /> A. 8 C<br /> B. 14 C<br /> C. 20 C<br /> D. -6 C<br /> <br /> 263. The potential at a point due to a charge is 15 V. If the distance is increased three times, the potential at the point will be<br /> A. 5 V<br /> B. 18 V<br /> C. 45 V<br /> D. 15 V<br /> <br /> 264. Electric potential is a _______ quantity.<br /> A. scalar<br /> B. phasor<br /> C. vector<br /> D. variable<br /> <br /> 265. The electric potential at a point in air due to a charge is 21 V. If the air is replaced by a medium of relative permittivity of 3, then electric potential at that point will be<br /> A. 63 V<br /> B. 21 V<br /> C. 7 V<br /> D. 42 V<br /> <br /> 266. The electric potential across part AB of a circuit is 5 V; point A being at higher potential. If a charge of 5 C moves from A to B, then energy released as<br /> A. 5 joules<br /> B. 25 joules<br /> C. 10 joules<br /> D. 100 joules<br /> <br /> 267. What is the other name for dielectric strength?<br /> A. Breakdown voltage<br /> B. Electric intensity<br /> C. Potential gradient<br /> D. Dielectric constant<br /> <br /> 268. Which of the following materials has the highest dielectric strength?<br /> A. Glass<br /> B. Oiled paper<br /> C. Mica<br /> D. Air<br /> <br /> 269. What is used as the insulating material or dielectric in an electric ion?<br /> A. Oiled paper<br /> B. Mica<br /> C. Paraffin<br /> D. Titanate compound<br /> <br /> 270. What is used as the dielectric material in high voltage transformers?<br /> A. Mica<br /> B. Paraffin<br /> C. Porcelain<br /> D. Oiled paper<br /> <br /> 271. One farad equals<br /> A. 1 coulomb/volt<br /> B. 1 newton/coulomb<br /> C. 1 newton-meter<br /> D. 1 volt/second/ampere<br /> <br /> 272. Which of the following is used by permanent magnets as the magnetic material?<br /> A. iron<br /> B. nickel<br /> C. soft steel<br /> D. hardened steel<br /> <br /> 273. Which of the following is used by temporary magnets as the magnetic material?<br /> A. Hardened steel<br /> B. Cobalt steel<br /> C. Soft iron<br /> D. Tungsten steel<br /> <br /> 274. What is the main advantage of temporary magnets?<br /> A. The magnetic flux can be changed.<br /> B. Hysteresis can be decreased.<br /> C. Magnetic materials can be used.<br /> D. Abundance of ferromagnetic material that can be temporarily magnetized.<br /> <br /> 275. Permanent magnets can be found in<br /> A. electric bells<br /> B. earphones<br /> C. relays<br /> D. dynamic loudspeakers<br /> <br /> 276. Temporary magnets are commonly employed in<br /> A. electric instruments<br /> B. motors<br /> C. moving coils loudspeakers<br /> D. magnetos<br /> <br /> 277. The force between two magnetic poles is _______ their pole strengths.<br /> A. directly proportional to<br /> B. the sum of<br /> C. inversely proportional to<br /> D. the product of<br /> <br /> 278. If the distance between two magnetic poles decreases by 2 times, the force between them<br /> A. decreases two times<br /> B. increases four times<br /> C. increases two times<br /> D. decreases four times<br /> <br /> 279. The force between two magnetic poles is _____ the relative permeability of the medium.<br /> A. directly proportional to<br /> B. independent of<br /> C. inversely proportional to<br /> D. equal to<br /> <br /> 280. Two similar poles, each 1Wb, placed 1 m apart in air will experience a repulsive force of<br /> A. 63000 N<br /> B. 63 × 10^-3 N<br /> C. 8 × 10^12 N<br /> D. 796 kN<br /> <br /> 281. One weber of flux is equal to _______ magnetic lines of force.<br /> A. 10^6<br /> B. 10^10<br /> C. 4π × 10^7<br /> D. 10^8<br /> <br /> 282. The unit of flux density is<br /> A. Wb/m<br /> B. Tesla<br /> C. At/m<br /> D. N/Wb<br /> <br /> 283. What is the typical saturation flux density for most magnetic materials?<br /> A. 4 Wb/m^2<br /> B. 5 Wb/m^2<br /> C. 1 Wb/m^2<br /> D. 2 Wb/m^2<br /> <br /> 284. Magnetic field intensity is a ________ quantity.<br /> A. scalar<br /> B. phasor<br /> C. vector<br /> D. variable<br /> <br /> 285. The force acting on a pole of 5 Wb is 25 N. What is the intensity of the magnetic field?<br /> A. 5 N/Wb<br /> B. 25 N/Wb<br /> C. 125 N/Wb<br /> D. 0.2 N/Wb<br /> <br /> 286. The relative permeability of a magnetic material is 10^5. What is its permeability?<br /> <br /> A. 4π × 10^5 H/m<br /> B. 4π × 10^-12 H/m<br /> C. 4π × 10^-2 H/m<br /> D. 4π × 10^-7 H/m<br /> <br /> 287. Which of the following has the highest permeability?<br /> A. Soft iron<br /> B. Steel<br /> C. Air<br /> D. Permalloy<br /> <br /> 288. A magnetic pole produces 5000 field lines. How much is the flux in webers?<br /> A. 50 × 10^-6<br /> B. 5 × 10^-6<br /> C. 500 × 10^-6<br /> D. 500 × 10^-5<br /> <br /> 289. As the magnetic intensity decreases, the relative permeability of a magnetic material<br /> A. decreases<br /> B. remains the same<br /> C. increases<br /> D. becomes zero<br /> <br /> 290. The permeability of a material having a flux density of 5 Wb/m^2 is 10^-5 H/m. What is the value of magnetizing force?<br /> A. 5 × 10^-5 N/Wb<br /> B. 500 × 10^3 N/Wb<br /> C. 4π × 10^-7 N/Wb<br /> D. 4π × 10^7 N/Wb<br /> <br /> 291. When the relative permeability of a material is slightly less than 1, it is called _____ material.<br /> A. diamagnetic<br /> B. ferromagnetic<br /> C. paramagnetic<br /> D. non-magnetic<br /> <br /> 292. When the relative permeability of a material is slightly more than 1, it is called ______ material.<br /> A. diamagnetic<br /> B. ferromagnetic<br /> C. paramagnetic<br /> D. non-magnetic<br /> <br /> 293. Which of the following is a diamagnetic material?<br /> A. Aluminum<br /> B. Silver<br /> C. Air<br /> D. Cobalt<br /> <br /> 294. Which of the following is a paramagnetic material?<br /> A. Carbon<br /> B. Bismuth<br /> C. Copper<br /> D. Oxygen<br /> <br /> 295. The greater percentage of materials is _________.<br /> A. diamagnetic<br /> B. paramagnetic<br /> C. ferromagnetic<br /> D. non-magnetic<br /> <br /> 296. When the relative permeability of a material is much greater than 1, it is called _______ material.<br /> A. diamagnetic<br /> B. ferromagnetic<br /> C. paramagnetic<br /> D. non-magnetic<br /> <br /> 297. The flux density in an air-cored coil is 10^-3 Wb/m^2. With a cast iron core of relative permeability 100 inserted, the flux density will become<br /> A. 10^-3 Wb/m^2<br /> B. 10^-2 Wb/m^2<br /> C. 10^3 Wb/m^2<br /> D. 0.1 Wb/m^2<br /> <br /> 298. At/m is a unit of<br /> A. mmf<br /> B. magnetic force<br /> C. reluctance<br /> D. magnetic flux density<br /> <br /> 299. The direction of force o a current carrying conductor placed in a magnetic field can be found by<br /> A. Cork screw rule<br /> B. Fleming’s left hand rule<br /> C. Fleming’s right hand rule<br /> D. using a compass<br /> <br /> 300. When a current carrying conductor is placed in a magnetic field, the maximum force will act on the conductor when the conductor is at an angle of _______ to the magnetic field.<br /> <br /> A. 45<span style="background-color: white; color: #545454; font-family: arial, sans-serif; font-size: x-small; line-height: 18.2000007629395px;">°</span><br /> B. 60<span style="background-color: white; color: #545454; font-family: arial, sans-serif; font-size: x-small; line-height: 18.2000007629395px;">°</span><br /> C. 30<span style="background-color: white; color: #545454; font-family: arial, sans-serif; font-size: x-small; line-height: 18.2000007629395px;">°</span><br /> D. 90<span style="background-color: white; color: #545454; font-family: arial, sans-serif; font-size: x-small; line-height: 18.2000007629395px;">°</span><br /> <div> <br /> <br /> Click the download button below to download this practice set <i>with answers</i> in PDF format.<br /> <a href="http://sh.st/g0b8i" target="_blank"><img alt="Engineering Reviewer" border="0" src="http://2.bp.blogspot.com/-_PFABbawQHQ/VA0kf6_YvjI/AAAAAAAAAZI/9qzE0TiS5Qs/s1600/dl.png" /></a></div>

MCQs / Engineering Reviewer - Electricity and Magnetism Fundamentals Part 6

Engineering Reviewer - Electricity and Magnetism Fundamentals Multiple Choice Questions Electricity and Magnetism Fundamentals 251. T...

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MCQs / Engineering Reviewer - Electricity and Magnetism Fundamentals Part 5

<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="http://2.bp.blogspot.com/-QgDtnOlr1A0/VQunJ9xUFPI/AAAAAAAABI8/prZSaus1tso/s1600/mcqs-electricty-magnetism.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="MCQs on Electricity and Magnetism Fundamentals" border="0" src="http://2.bp.blogspot.com/-QgDtnOlr1A0/VQunJ9xUFPI/AAAAAAAABI8/prZSaus1tso/s1600/mcqs-electricty-magnetism.jpg" title="MCQs on Electricity and Magnetism Fundamentals" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;"><span style="font-size: 12.8000001907349px;">Engineering Reviewer - Electricity and Magnetism Fundamentals</span></td></tr> </tbody></table> <b>Multiple Choice Questions</b><br /> <b>Electricity and Magnetism Fundamentals</b><br /> <div> <br /></div> <div> <div> 200. Which of the following materials has the least hysteresis loop area?</div> <div> A. soft iron</div> <div> B. silicon steel</div> <div> C. hard steel</div> <div> D. wrought iron</div> <div> <br /></div> <div> 201. Core materials of a good relay have _________ hysteresis loop.</div> <div> A. large</div> <div> B. narrow</div> <div> C. very large</div> <div> D. very narrow</div> <div> <br /></div> <div> 202. The magnetic materials should have a large hysteresis loss for one of the following applications.</div> <div> A. Transformers</div> <div> B. AC motors</div> <div> C. Permanent Magnets</div> <div> D. DC generators</div> <div> <br /></div> <div> 203. If the magnetic material is located within a coil through which alternating current (60 Hz frequency) flows, then __________ hysteresis loops will be formed every second.</div> <div> A. 60</div> <div> B. 120</div> <div> C. 30</div> <div> D. 180</div> <div> <br /></div> <div> 204. There are how many compounds available in nature?</div> <div> A. 105</div> <div> B. 1000</div> <div> C. 300,000</div> <div> D. Unlimited</div> <div> <br /></div> <div> 205. Hysteresis is a phenomenon of _________ in a magnetic circuit.</div> <div> A. setting up constant flux</div> <div> B. lagging of H behind B</div> <div> C. lagging B behind H</div> <div> D. leading B ahead H</div> <div> <br /></div> <div> 206. What is the measure of the density and sign of the electric charge at a point relative to that at some time?</div> <div> A. Electric potential</div> <div> B. Electric charge</div> <div> C. Electric current</div> <div> D. Electric intensity</div> <div> <br /></div> <div> 207.  __________ is a substance of whose molecules consist of the same kind of atom.</div> <div> A. Mixture</div> <div> B. Compound</div> <div> C. Element</div> <div> D. Isotope</div> <div> <br /></div> <div> 208. Hipernik is an alloy containing __________ iron and __________ nickel.</div> <div> A.  40% ; 60%</div> <div> B. 60% ; 40%</div> <div> C. 50% ; 50%</div> <div> D. 70% ; 30%</div> <div> <br /></div> <div> 209.  The mass of proton is __________ the mass of an electron.</div> <div> A. equal to</div> <div> B. about 1837 times</div> <div> C. less than</div> <div> D. 200 times</div> <div> <br /></div> <div> 210. What is the maximum number of electrons that can be accommodated in the last orbit of an atom?</div> <div> A. 4</div> <div> B. 2</div> <div> C. 8</div> <div> D. 18</div> <div> <br /></div> <div> 211. The electrons in the last orbit of an atom are called _______ electrons.</div> <div> A. free</div> <div> B. valence</div> <div> C. bound</div> <div> D. thermionic</div> <div> <br /></div> <div> 212. If the number of valence electrons of an atom is less than 4, the substance is called</div> <div> A. a conductor</div> <div> B. a semiconductor</div> <div> C. an insulator</div> <div> D. a superconductor</div> <div> <br /></div> <div> 213. If the number of valence electrons of an atom is more than 4, the substance is called</div> <div> A. a semiconductor</div> <div> B. a conductor</div> <div> C. an insulator</div> <div> D. a semi-insulator</div> <div> <br /></div> <div> 214. If the number of valence electrons of an atom is exactly 4, then the substance is called</div> <div> A. a semiconductor</div> <div> B. a conductor</div> <div> C. an insulator</div> <div> D. a cryogenic conductor</div> <div> <br /></div> <div> 215. If the number of valence electrons of an atom is less than 4, then the substance is probably</div> <div> A. a metal</div> <div> B. an insulator</div> <div> C. a non-metal</div> <div> D. a semiconductor</div> <div> <br /></div> <div> 216. One coulomb of charge consists of ________ electrons.</div> <div> A. 624 × 10^16</div> <div> B. 62.4 × 10^16</div> <div> C. 6.24 × 10^16</div> <div> D. 0.624 × 10^16</div> <div> <br /></div> <div> 217. A one cubic cm of copper has how many free electrons at room temperature?</div> <div> A. 80 × 10^18</div> <div> B. 8.5 × 10^22</div> <div> C. 20 × 10^10</div> <div> D. 50 × 10^20</div> <div> <br /></div> <div> 218. Electronic current in a wire is the flow of ____________ electrons.</div> <div> A. free</div> <div> B. valence</div> <div> C. bound</div> <div> D. loose</div> <div> <br /></div> <div> 219. Electromotive force in a circuit</div> <div> A. causes free electrons to flow</div> <div> B. increases the circuit resistance</div> <div> C. maintains circuit resistance</div> <div> D. is needed to make the circuit complete</div> <div> <br /></div> <div> 220. The resistance of a material is ____________ its area of cross-section.</div> <div> A. directly proportional</div> <div> B. independent of</div> <div> C. inversely proportional to</div> <div> D. equal to</div> <div> <br /></div> <div> 221. If the length and area of cross-section of a wire are doubled, then its resistance</div> <div> A. becomes four times</div> <div> B. becomes sixteen times</div> <div> C. remains the same</div> <div> D. becomes two times</div> <div> <br /></div> <div> 222. A length of wire has a resistance of 10 ohms. What is the resistance of a wire of the same material three times as long and twice the cross-sectional area?</div> <div> A. 30 ohms</div> <div> B. 20 ohms</div> <div> C. 15 ohms</div> <div> D. 7 ohms</div> <div> <br /></div> <div> 223. What is the SI unit of specific resistance or resistivity?</div> <div> A. Ohm-circular mil per inch</div> <div> B. Ohm-circular mil per foot</div> <div> C. Ohm-m</div> <div> D. Ohm-cm</div> <div> <br /></div> <div> 224. The resistivity of a conductor ___________ with an increase in temperature.</div> <div> A. increases</div> <div> B. decreases</div> <div> C. remains the same</div> <div> D. becomes zero</div> <div> <br /></div> <div> 225. What is the SI unit of conductance?</div> <div> A. Siemens</div> <div> B. Mhos</div> <div> C. Ohms</div> <div> D. 1/Ohms</div> <div> <br /></div> <div> 226. If the resistance of a material 2 m long and 2 m^2 in area of cross-section is 1.6 ×10^-8 Ω, then its resistivity is</div> <div> A. 3.2 × 10^-8 Ω-m</div> <div> B. 1.6 × 10^-8 Ω-m</div> <div> C. 0.64 × 10^-8 Ω-m</div> <div> D. 0.16 × 10^-8 Ω-m </div> <div> <br /></div> <div> 227. What is the SI unit of conductivity?</div> <div> A. Ohms/m</div> <div> B. Ohms-m</div> <div> C. Siemens-m</div> <div> D. Siemens/m</div> <div> <br /></div> <div> 228. The temperature coefficient of resistance of conductors is</div> <div> A. positive</div> <div> B. zero</div> <div> C. negative</div> <div> D. infinite</div> <div> <br /></div> <div> 229. The temperature coefficient of resistance of semiconductors is</div> <div> A. positive</div> <div> B. zero</div> <div> C. negative</div> <div> D. infinite</div> <div> <br /></div> <div> 230. What determines the value of the temperature coefficient of resistance of a material?</div> <div> A. length</div> <div> B. cross-sectional area</div> <div> C. volume</div> <div> D. nature and temperature</div> <div> <br /></div> <div> 231. The temperature coefficient of resistance of a conductor ______ with an increase in temperature.</div> <div> A. increases</div> <div> B. decreases</div> <div> C. remains the same</div> <div> D. becomes negative</div> <div> <br /></div> <div> 232. The temperature coefficient of resistance of insulators is</div> <div> A. zero</div> <div> B. negative</div> <div> C. positive</div> <div> D. infinite</div> <div> <br /></div> <div> 233. The temperature coefficient of resistance of eureka is</div> <div> A. positive</div> <div> B. negative</div> <div> C. almost zero</div> <div> D. infinite</div> <div> <br /></div> <div> 234. If the value of α0 a conductor is 1/234 per oC, then the value of α18 is</div> <div> A. 1/218 per oC</div> <div> B. 1/252 per oC</div> <div> C. 1/272 per oC</div> <div> D. 1/273 per oC</div> <div> <br /></div> <div> 235. If the value of α25 a conductor is 1/255 per oC, then the value of α20 is</div> <div> A. 1/300 per oC</div> <div> B. 1/250 per oC</div> <div> C. 1/230 per oC</div> <div> D. 1/260 per oC</div> <div> <br /></div> <div> 236. If the value of α25 of a conductor is 1/230 per oC, then the value of α0 is</div> <div> A. 1/180 per oC</div> <div> B. 1/150 per oC</div> <div> C. 1/280 per oC</div> <div> D. 1/230 per oC</div> <div> <br /></div> <div> 237. Ohm’s law cannot be applied to which material?</div> <div> A. Copper</div> <div> B. Silver</div> <div> C. Silicon carbide</div> <div> D. Aluminum</div> <div> <br /></div> <div> 238. What is the practical unit of electrical energy?</div> <div> A. Watt</div> <div> B. Kilowatt-hour</div> <div> C. Kilowatt-second</div> <div> D. Megawat-hour</div> <div> <br /></div> <div> 239. A 200-watt lamp working for 24 hours will consume approximately _____ units.</div> <div> A. 50</div> <div> B. 5</div> <div> C. 24</div> <div> D. 0.5</div> <div> <br /></div> <div> 240. The hot resistance of an incandescent lamp is about _______ its cold resistance.</div> <div> A. 10 times</div> <div> B. 100 times</div> <div> C. 5 times</div> <div> D. 50 times </div> <div> <br /></div> <div> 241. Under ordinary conditions, a body is considered</div> <div> A. positively charged</div> <div> B. neutral</div> <div> C. negatively charged</div> <div> D. stable</div> <div> <br /></div> <div> 242. A positively charged body has</div> <div> A. deficit of electrons</div> <div> B. excess of neutrons</div> <div> C. excess of electrons</div> <div> D. deficit of protons</div> <div> <br /></div> <div> 243. A negatively charge body has</div> <div> A. deficit of electrons</div> <div> B. excess of protons</div> <div> C. excess of electrons</div> <div> D. deficit of neutrons </div> <div> <br /></div> <div> 244. This paper does not exhibit electricity because it contains the same number of</div> <div> A. protons and electrons</div> <div> B. neutrons and electrons</div> <div> C. neutrons and positrons</div> <div> D. atoms</div> <div> <br /></div> <div> 245. What is the value of the absolute permittivity of air?</div> <div> A. 8.854 μF/m</div> <div> B. 8.854 × 10^-12 mF/m</div> <div> C. 8.854 × 10^-12 F/m</div> <div> D. 8.854 × 10^-12 μF/m</div> <div> <br /></div> <div> 246. What is the relative permittivity of air?</div> <div> A. 0</div> <div> B. 1</div> <div> C. 8.854 × 10^-12</div> <div> D. 4π × 10^-7</div> <div> <br /></div> <div> 247. If two similar charges 1 coulomb each are placed 1 m apart in air, then the force of repulsion is</div> <div> A.8 × 10^6 N</div> <div> B. 9 × 10 ^9 N</div> <div> C. 10^6 N</div> <div> D. 5 × 10^6 N</div> <div> <br /></div> <div> 248. If the relative permittivity of a material is 10, then its permittivity is</div> <div> A. 4π × 10^-7 F/m</div> <div> B. 4π × 10^-6 F/m</div> <div> C. 8.854 × 10^-11 F/m</div> <div> D. 8.854 × 10^-12 F/m</div> <div> <br /></div> <div> 249. The force between two charges placed a given distance apart ______ as the relative permittivity of the medium is increased.</div> <div> A. increases</div> <div> B. decreases</div> <div> C. remains unchanged</div> <div> D. becomes infinite</div> <div> <br /></div> <div> 250. What is another name for relative permittivity?</div> <div> A. Dielectric strength</div> <div> B. Electric intensity</div> <div> C. Potential gradient</div> <div> D. Dielectric constant</div> </div> <div> <br /> <br /> Click the download button below to download this practice set <i>with answers</i> in PDF format.<br /> <a href="http://sh.st/g0b4s" target="_blank"><img alt="Engineering Reviewer" border="0" src="http://2.bp.blogspot.com/-_PFABbawQHQ/VA0kf6_YvjI/AAAAAAAAAZI/9qzE0TiS5Qs/s1600/dl.png" /></a></div>

MCQs / Engineering Reviewer - Electricity and Magnetism Fundamentals Part 5

Engineering Reviewer - Electricity and Magnetism Fundamentals Multiple Choice Questions Electricity and Magnetism Fundamentals 200...

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MCQs / Engineering Reviewer - Electricity and Magnetism Fundamentals Part 4

<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="http://2.bp.blogspot.com/-QgDtnOlr1A0/VQunJ9xUFPI/AAAAAAAABI8/prZSaus1tso/s1600/mcqs-electricty-magnetism.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="MCQs on Electricity and Magnetism Fundamentals" border="0" src="http://2.bp.blogspot.com/-QgDtnOlr1A0/VQunJ9xUFPI/AAAAAAAABI8/prZSaus1tso/s1600/mcqs-electricty-magnetism.jpg" title="MCQs on Electricity and Magnetism Fundamentals" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;"><span style="font-size: 12.8000001907349px;">Engineering Reviewer - Electricity and Magnetism Fundamentals</span></td></tr> </tbody></table> <b>Multiple Choice Questions</b><br /> <b>Electricity and Magnetism Fundamentals</b><br /> <br /> 151. How is mutual inductance between two coils decreased?<br /> A. By using a common core<br /> B. By moving the coils closer<br /> C. By moving the coils apart<br /> D. By increasing the number of turns of either coil<br /> <br /> 152. A magnetic field is<br /> A. The current flow through space around a permanent magnet<br /> B. The force set up when current flows through a conductor<br /> C. The force that drives current through a resistor<br /> D. The force between the plates of a charged capacitor<br /> <br /> 153. Ohm’s law can be used only to a _____ circuit or component.<br /> A. Unilateral<br /> B. Exponential<br /> C. Trivalent<br /> D. Linear<br /> <br /> 154. When the current flows, the magnetic field ……. conductor is in what direction?<br /> A. The same as the current direction<br /> B. Opposite the current direction<br /> C. Omnidirectional<br /> D. In the direction determined by the left hand rule<br /> <br /> 155. The magnetic field around the conductor is determined by the<br /> A. Size of the conductor<br /> B. Amount of current<br /> C. Current divided by the resistance<br /> D. Resistance divided by the current<br /> <br /> 156. Back emf refers to the<br /> A. Current equal to the applied emf<br /> B. Opposing emf<br /> C. Current opposing the applied emf<br /> D. Voltage opposing the applied emf<br /> <br /> 157. The magnetic flux through a coil changes. This results to the induced emf acting in a direction as to<br /> A. Oppose the change<br /> B. Aid the change<br /> C. Either oppose or aid the change<br /> D. Neither oppose nor aid the change<br /> <br /> 158. A magnetic flux of 2.5 x10^4 Wb through an area of 5 x10^4 square meters results in<br /> A. 5 Wb<br /> B. 0.5 Tesia of flux density<br /> C. 5x 10^-5 Wb of flux<br /> D. 5000 Tesia of flux density<br /> <br /> 159. If a 20 V potential is applied across a relay coil with 50 turns having 1 Ω of resistance, the total magnetomotive producing magnetic flux in the circuit is<br /> A. 10 Wb<br /> B. 50 T<br /> C. 1000 A t/m<br /> D. 1000 A.t<br /> <br /> 160. What is the reluctance of a magnetic path having a length of 2x 10^-3m and cross- sectional area of 2.5 x 10^-3 m^2?<br /> A. 6366 A.t/Wb<br /> B. 6000 A.t/Wb<br /> C. 8x10^-3 A.t/Wb<br /> D. 0.8 A.t/Wb<br /> <br /> 161. Calculate the permeability (in T/A. t/m) of a magnetic material that has a relative permeability of 300<br /> A. 3.78 x 10^-4<br /> B. 3.78 x 10^-5<br /> C. 3.78 x 10^-3<br /> D. 3.78 x 10^-6<br /> <br /> 162. Calculate the flux density that will be produced by the field intensity of 2000 a. t/m for a permeability of 126 x 10^-6 T/A.t/m<br /> A. 0.252 G<br /> B. 0.252 x 10^-2 T<br /> C. 0.252 T<br /> D. 0.252 x 10^-2 G<br /> <br /> 163. How many turns are needed to produce a magnetomotive force of 1000 A.t for a coil with 6 amperes?<br /> A. 6000 turns<br /> B. 600 turns<br /> C. 167 turns<br /> D. 67 turns<br /> <br /> 164. A 6- V battery is connected across a solenoid of 100 turns having a resistance of 2 Ω, Calculate the number of ampere turns?<br /> A. 100<br /> B. 50<br /> C. 300<br /> D. 600<br /> <br /> 165. What determines the atomic number of an element?<br /> A. The number of protons<br /> B. The number of electrons<br /> C. The number of neutrons<br /> D. The number of neutrons and protons<br /> <br /> 166. One of the solid structures in which the position of the atoms or ions are predetermined<br /> A. Crystalline solid<br /> B. Amorphous solid<br /> C. Polycrystalline solid<br /> D. Poly- amorphous solid<br /> <br /> 167. Mmf in a magnetic circuit corresponds to _____ in an electric circuit<br /> A. Emf<br /> B. Voltage drop<br /> C. Electric Field Intensity<br /> D. Potential gradient<br /> <br /> 168. What solid has no defined crystal structure except perhaps in the arrangement of the nearest neighboring atoms or ions?<br /> A. Crystalline<br /> B. Amorphous<br /> C. Polycrystalline<br /> D. Poly- amorphous<br /> <br /> 169. Amorphous solid is also called<br /> A. Crystalline<br /> B. Non- crystalline<br /> C. Polycrystalline<br /> D. Homogenous<br /> <br /> 170. A principle that states that only two electrons with different spins are allowed to exist in a given orbit<br /> A. Bohr’s principle<br /> B. Pauli exclusion principle<br /> C. Avogadro’s principle<br /> D. Coulomb’s principle<br /> <br /> 171. What bond is formed when one or more electrons in the outermost energy orbit of an atom are transferred to another?<br /> A. Ionic<br /> B. Covalent<br /> C. Metallic<br /> D. Van der Waals<br /> <br /> 172. In electro-mechanical conversion devices like generators and motors the reason why a small air gap is left between the rotor and stator is to<br /> A. permit mechanical clearance<br /> B. increase flux density in air gap<br /> C. decrease the reluctance of magnetic path<br /> D. complete the magnetic path<br /> <br /> 173. What bond is formed when electrons in the outermost energy orbits of the atoms are shared between two or more electrons?<br /> A. Ionic<br /> B. Covalent<br /> C. Metallic<br /> D. Van der Waals<br /> <br /> 174. Why is it that the magnitude of magnetomotive force required for air gap is much greater than that required for iron part of a magnetic circuit?<br /> A. Because air is a gas<br /> B. Because air has the highest relative permeability<br /> C. Because air is a conductor of magnetic flux<br /> D. Because air has the lowest relative permeability<br /> <br /> 175. What type of bond is formed when there exists some form of collective interactions between the (negatively charged) electrons and (positively charged) nuclei in a solid?<br /> A. Ionic<br /> B. Covalent<br /> C. Metallic<br /> D. Van der Waals<br /> <br /> 176. Permeance of a magnetic circuit is _________ the cross-sectional area of the circuit.<br /> A. directly proportional to<br /> B. inversely proportional to<br /> C. dependent of<br /> D. independent of<br /> <br /> 177. Formed when there exist distant electronic interactions between (opposite) charges present in the neighboring atoms or molecules.<br /> A. Ionic bond<br /> B. Covalent bond<br /> C. Metallic bond<br /> D. Van der Waals bond<br /> <br /> 178. Defined as the ratio of the volume occupied by the atoms or ions in a unit cell divided by the volume of the unit cell and is used to measure the compactness of a crystal.<br /> A. Atomic packing factor (APF)<br /> B. Ionic Packing Ratio (IPR)<br /> C. Atomic compacting factor (ACF)<br /> D. Ionic compacting ratio (ICR)<br /> <br /> 179. A factor used to correct for the electrostatic forces of the more distant ions in an ionic solid.<br /> A. Avogadro’s number<br /> B. Planck’s constant<br /> C. Boltzmann’s constant<br /> D. Madelung constant<br /> <br /> 180. The conduction of electricity across the surface of a dielectric is called<br /> A. creepage<br /> B. skin effect<br /> C. surface effect<br /> D. crosstalk<br /> <br /> 181. A magnetic circuit carries a flux φi in the iron part and a flux φg in the air gap. What is the leakage coefficient?<br /> A. φi/ φg<br /> B. φi × φg<br /> C. φg /φi<br /> D. φi + φg<br /> <br /> 182. A law stating that the magnetic susceptibilities of most paramagnetic substances are inversely proportional to their absolute temperatures.<br /> A. Curie’s Law<br /> B. Child’s Law<br /> C. CR Law<br /> D. Curie-Weiss Law<br /> <br /> 183. The reluctance of the magnetic circuit is ________ relative permeability of the material comprising the circuit.<br /> A. directly proportional to<br /> B. inversely proportional to<br /> C. independent of<br /> D. dependent of<br /> <br /> 184. A law relating between the magnetic and electric susceptibilities and the absolute temperatures which is followed b ferromagnets, antiferromagnets, non-polar ferroelectrics, antiferroelectrics and some paramagnets.<br /> A. Curie’s Law<br /> B. Child’s Law<br /> C. CR Law<br /> D. Curie-Weiss Law<br /> <br /> 185. Theory of ferromagnetic phenomena which assumes each atom is a permanent magnet which can turn freely about its center under the influence of applied field and other magnets.<br /> A. Ewing’s theory of ferromagnetism<br /> B. Oersted’s ferromagnetism theory<br /> C. Maxwell’s magnetic theory<br /> D. Ampere’s circuital law<br /> <br /> 186. The reluctance of a magnetic circuit varies with<br /> A. length × area<br /> B. area ÷ length<br /> C. length ÷ area<br /> D. length + area<br /> <br /> 187. A theorem which states that an electric current flowing in a circuit produces a magnetic field at external points equivalent to that due to a magnetic shell whose bounding edge is the conductor and whose strength of the current.<br /> A. Joule’s law<br /> B. Faraday’s law<br /> C. Volta’s theorem<br /> D. Ampere’s theorem<br /> <br /> 188. What is the usual value of leakage coefficient for electrical machines?<br /> A. 0.5 to 1<br /> B. 1 to 5<br /> C. 5 to 10<br /> D. 1.15 to 1.25<br /> <br /> 189. The science of adapting electronics to aerospace flight.<br /> A. Avionics<br /> B. Aerotronics<br /> C. Aerodynamics<br /> D. Astrionics<br /> <br /> 190. The reluctance of a magnetic circuit is not dependent on which of the following?<br /> A. Number of turns of coil<br /> B. Magnetomotive force<br /> C. Flux density in the circuit<br /> D. Current in the coil<br /> <br /> 191. Another term for corona discharge.<br /> A. Lightning<br /> B. Sparking<br /> C. Aurora<br /> D. Corona Effect<br /> <br /> 192. The B-H curve for ________ is a straight line passing through the origin.<br /> A. cobalt<br /> B. air<br /> C. hardened steel<br /> D. soft iron<br /> <br /> 193. The phenomenon that when an electric current passes through an anisotropic crystal, there is an absorption or liberation of heat due to the non-uniformity in current distribution.<br /> A. Bridgman effect<br /> B. Corona effect<br /> C. Dember effect<br /> D. Destriau effect<br /> <br /> 194. The B-H curve of ________ is not a straight line.<br /> A. air<br /> B. wood<br /> C. silicon steel<br /> D. soft iron<br /> <br /> 195. If a magnetic flux cuts across 200 turns at a rate of 2Wb/s, the induced voltage according to Faraday’s law is about<br /> A. 400 V<br /> B. 100 V<br /> C. 200 V<br /> D. 600 V<br /> <br /> 196. What is the SI unit of reluctance?<br /> A. At<br /> B. At/m<br /> C. N/Wb<br /> D. At/Wb<br /> <br /> 197. A magnetizing force of 1000 AT/m will produce a flux density of __________ in air.<br /> A. 1.257 mWb/m^2<br /> B. 0.63 Wb/m^2<br /> C. 1.257 Wb/m^2<br /> D. 0.63 mWb/m^2<br /> <br /> 198. Hysteresis loss can be reduced by one of the following.<br /> A. Increasing mmf of the circuit<br /> B. Using material narrow hysteresis loop<br /> C. Using ferromagnetic core<br /> D. Laminating the magnetic circuit<br /> <br /> 199. The core of a transformer heats up when its primary is fed from an ac source because of<br /> A. permeability<br /> B. ferromagnetism<br /> C. reluctance of core<br /> D. hysteresis loss<br /> <br /> 200. Which of the following materials has the least hysteresis loop area?<br /> A. soft iron<br /> B. silicon steel<br /> C. hard steel<br /> D. wrought iron<br /> <div> <br /> <br /> Click the download button below to download this practice set <i>with answers</i> in PDF format.<br /> <a href="http://sh.st/g0b1h" target="_blank"><img alt="Engineering Reviewer" border="0" src="http://2.bp.blogspot.com/-_PFABbawQHQ/VA0kf6_YvjI/AAAAAAAAAZI/9qzE0TiS5Qs/s1600/dl.png" /></a></div>

MCQs / Engineering Reviewer - Electricity and Magnetism Fundamentals Part 4

Engineering Reviewer - Electricity and Magnetism Fundamentals Multiple Choice Questions Electricity and Magnetism Fundamentals 151. H...

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MCQs / Engineering Reviewer - Electricity and Magnetism Fundamentals Part 3

<div class="separator" style="clear: both; text-align: center;"> </div> <table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="http://2.bp.blogspot.com/-QgDtnOlr1A0/VQunJ9xUFPI/AAAAAAAABI8/prZSaus1tso/s1600/mcqs-electricty-magnetism.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="MCQs on Electricity and Magnetism Fundamentals" border="0" src="http://2.bp.blogspot.com/-QgDtnOlr1A0/VQunJ9xUFPI/AAAAAAAABI8/prZSaus1tso/s1600/mcqs-electricty-magnetism.jpg" title="MCQs on Electricity and Magnetism Fundamentals" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;"><span style="font-size: 12.8000001907349px;">Engineering Reviewer - Electricity and Magnetism Fundamentals</span></td></tr> </tbody></table> <b>Multiple Choice Questions</b><br /> <b>Electricity and Magnetism Fundamentals</b><br /> <br /> 101. How many neutrons does a copper atom have?<br /> A. 32<br /> B. 33<br /> C. 34<br /> D. 29<br /> <br /> 102. Bonding of atoms that is due to the force of attraction between positive ions and a group of negative ions<br /> A. Ionic bond<br /> B. Covalent Bond<br /> C. Electrostatic Bond<br /> D. Metallic bond<br /> <br /> 103. An alloy of 22 percent iron and 78 per cent nickel.<br /> A. Permalloy<br /> B. Alnico<br /> C. Constantan<br /> D. Manganin<br /> <br /> 104. An alloy of 40 percent iron and 60 percent nickel.<br /> A. Alnico<br /> B. Permalloy<br /> C. Hipernik<br /> D. Manganin<br /> <br /> 105. A commercial alloy of aluminum nickel, and iron with cobalt, copper and titanium added to produce about 12 grades.<br /> A. Alnico<br /> B. Brass<br /> C. Aluminum<br /> D. Constantan<br /> <br /> 106. The idea of preventing one component from affecting another through their common electric and magnetic field is referred to as<br /> A. Hall effect<br /> B. Grounding<br /> C. Shielding<br /> D. Limiting<br /> <br /> 107. The physical motion resulting from the forces of magnetic fields is called<br /> A. Motor action<br /> B. Rotation<br /> C. Repulsion<br /> D. Torque action<br /> <br /> 108. Flux linkages equals<br /> A. Flux times area of core<br /> B. Flux times number of turns times area of core<br /> C. Flux times number of turns times length of core<br /> D. Flux times number of turns<br /> <br /> 109. Which of the following is a vector quantity?<br /> A. Magnetic potential<br /> B. Magnetic field intensity<br /> C. Magnetic permeability<br /> D. Flux density<br /> <br /> 110. Which of the following electric quantities is vector in character?<br /> A. Field<br /> B. Charge<br /> C. Energy<br /> D. Potential Difference<br /> <br /> 111. The quantity 10^6 maxwells is equivalent to one<br /> A. Weber<br /> B. Gauss<br /> C. Gilbert<br /> D. Tesla<br /> <br /> 112. What is the unit of reluctance?<br /> A. Maxwell<br /> B. Gauss<br /> C. At/Wb<br /> D. Weber<br /> <br /> 113. What is the SI unit of magnetic flux?<br /> A. Tesla<br /> B. Weber<br /> C. Maxwell<br /> D. Gauss<br /> <br /> 114. What is the unit of magnetomotive force?<br /> A. Volt<br /> B. Tesla<br /> C. Ampere- turn<br /> D. Weber<br /> <br /> 115. What is the cgs unit of magnetomotive force?<br /> A. Gilbert<br /> B. Ampere- turn<br /> C. Maxwell<br /> D. Weber<br /> <br /> 116. The unit of flux is _____ in cgs system.<br /> A. Tesia<br /> B. Gilbert<br /> C. Maxwell<br /> D. Oersted<br /> <br /> 117. Flux density is measured in<br /> A. Tesia<br /> B. Weber<br /> C. Ampere- turn<br /> D. Maxwell<br /> <br /> 118. The customary energy unit in atomic and nuclear physics is<br /> A. Joule<br /> B. Volt- coulomb<br /> C. electron-volt<br /> D. Walt- second<br /> <br /> 119. One ampere- turn is equivalent to _____ gilberts<br /> A. 1.16<br /> B. 1.26<br /> C. 1.36<br /> D. 1.46<br /> <br /> 120. The magnetic flux of 2000 lines is how many Maxwells?<br /> A. 1000<br /> B. 2000<br /> C. 4000<br /> D. 8000<br /> <br /> 121. How much is the flux in Weber in the above problem?<br /> A. 2 x 10^-5<br /> B. 2 x 10^-3<br /> C. 2 x 10^5<br /> D. 2 x 10^3<br /> <br /> 122. One oersted (Oe) is equivalent to _____ Gb/cm.<br /> A. 1<br /> B. 10<br /> C. 100<br /> D. 1000<br /> <br /> 123. One electron volt (1 eV) is equivalent to _____ joules<br /> A. 1.3 x 10^-19<br /> B. 1.4 x 10^-19<br /> C. 1.5 x 10^-19<br /> D. 1.6 x 10^-19<br /> <br /> 124. An electron- volt (eV) is a unit of<br /> A. Energy<br /> B. Potential difference<br /> C. Charge<br /> D. Momentum<br /> <br /> 125. The unit of electrical energy is<br /> A. Joule<br /> B. Watt- second<br /> C. Kilowatt- hour<br /> D. All of these<br /> <br /> 126. Electrons at the outer shell are called<br /> A. Outer shell electrons<br /> B. Inner shell electrons<br /> C. Semiconductor electrons<br /> D. Valence electrons<br /> <br /> 127. Which of the following has the least number of valence electrons?<br /> A. Conductor<br /> B. Semiconductor<br /> C. Insulator<br /> D. Semi- insulator<br /> <br /> 128. A good conductor has how many valence electrons?<br /> A. 1<br /> B. 4<br /> C. 2<br /> D. 8<br /> <br /> 129. Which element has four valence electrons?<br /> A. Conductor<br /> B. Insulator<br /> C. Semiconductor<br /> D. Semi- insulator<br /> <br /> 130. A negative ion results when an atom gains an additional<br /> A. Electron<br /> B. Proton<br /> C. Neutron<br /> D. Atom<br /> <br /> 131. An atom or a group of atoms that carries a net electric charge.<br /> A. Positive ion<br /> B. Negative ion<br /> C. Ion<br /> D. Electron<br /> <br /> 132. Hysteresis refers to the ______ between flux density of the material and the magnetizing force applied.<br /> A. Leading effect<br /> B. Ratio<br /> C. Equality<br /> D. Lagging effect<br /> <br /> 133. Hydrogen is an example of a _____ material.<br /> A. Paramagnetic<br /> B. Diamagnetic<br /> C. Ferromagnetic<br /> D. Non- magnetic<br /> <br /> 134. Cobalt is an example of a ______ material.<br /> A. Paramagnetic<br /> B. Diamagnetic<br /> C. Ferromagnetic<br /> D. Non- magnetic<br /> <br /> 135. The evaporation of electrons from a heated surface is called<br /> A. Radiation<br /> B. Convection<br /> C. Thermionic emission<br /> D. Conduction<br /> <br /> 136. Electron is a Greek word for<br /> A. amber<br /> B. Fire<br /> C. Stone<br /> D. Heat<br /> <br /> 137. Gases whose particles are charged are known as<br /> A. Conductors<br /> B. Insulators<br /> C. Gaseous Conductors<br /> D. Plasma<br /> <br /> 138. What principle states that each electron in an atom must have a different set of quantum numbers?<br /> A. Inclusion principle<br /> B. Exclusion principle<br /> C. Quantum principle<br /> D. Electron principle<br /> <br /> 139. The energy stored in an electrostatic field or electromagnetic field is called<br /> A. Electromagnetic energy<br /> B. Kinetic energy<br /> C. Potential energy<br /> D. Rest energy<br /> <br /> 140. Which of the following statements is TRUE?<br /> A. Silicon dioxide is a good<br /> B. The current carriers in conductors are valence electrons<br /> C. For conductors, the valence electron are strongly attracted to the nucleus<br /> D. The valence electrons are located in the nucleus of an atom<br /> <br /> 141. How many electrons are needed in the valence orbit to give a material’s stability?<br /> A. 8<br /> B. 4<br /> C. 6<br /> D. 5<br /> <br /> 142. Residual magnetism refers to the flux density, which exists in the iron core when the magnetic field intensity is<br /> A. Minimized<br /> B. Reduced to zero<br /> C. Maximize<br /> D. Unity<br /> <br /> 143. Magnetic intensity is a<br /> A. Phasor quantity<br /> B. Physical quantity<br /> C. Scalar quantity<br /> D. Vector quantity<br /> <br /> 144. The core of a magnetic equipment uses a magnetic material with<br /> A. Least permeability<br /> B. Low permeability<br /> C. Moderate permeability<br /> D. High permeability<br /> <br /> 145. Which of the following is a paramagnetic material?<br /> A. Carbon<br /> B. Copper<br /> C. Bismuth<br /> D. Oxygen<br /> <br /> 146. The permeability of permalloy is<br /> A. Very much greater than permeability of air<br /> B. Slightly greater than permeability of air<br /> C. Slightly less than permeability of air<br /> D. Equal to the permeability of air<br /> <br /> 147. A t/m is a unit of<br /> A. Mmf<br /> B. Emf<br /> C. Reluctance<br /> D. Magnetizing force<br /> <br /> 148. The force between two magnetic poles is _____ their poles strength.<br /> A. equal to<br /> B. directly proportional to<br /> C. inversely proportional to<br /> D. directly proportional to the square root of<br /> <br /> 149. The magnetic energy stored in an inductor is ______ current.<br /> A. Directly proportional to<br /> B. Inversely proportional to<br /> C. Directly proportional to the square of<br /> D. Inversely proportional to the square of<br /> <br /> 150. One of the common application of an air- cored choke.<br /> A. Radio frequency<br /> B. Audio frequency<br /> C. Power supply<br /> D. Power transformer<br /> <br /> <br /> Click the download button below to download this practice set <i>with answers</i> in PDF format.<br /> <a href="http://sh.st/g0bCN" target="_blank"><img alt="Engineering Reviewer" border="0" src="http://2.bp.blogspot.com/-_PFABbawQHQ/VA0kf6_YvjI/AAAAAAAAAZI/9qzE0TiS5Qs/s1600/dl.png" /></a>

MCQs / Engineering Reviewer - Electricity and Magnetism Fundamentals Part 3

Engineering Reviewer - Electricity and Magnetism Fundamentals Multiple Choice Questions Electricity and Magnetism Fundamentals 101....

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MCQs / Engineering Reviewer - Electricity and Magnetism Fundamentals Part 2

<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="http://2.bp.blogspot.com/-QgDtnOlr1A0/VQunJ9xUFPI/AAAAAAAABI8/prZSaus1tso/s1600/mcqs-electricty-magnetism.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="MCQs on Electricity and Magnetism Fundamentals" border="0" src="http://2.bp.blogspot.com/-QgDtnOlr1A0/VQunJ9xUFPI/AAAAAAAABI8/prZSaus1tso/s1600/mcqs-electricty-magnetism.jpg" title="MCQs on Electricity and Magnetism Fundamentals" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;"><span style="font-size: 12.8000001907349px;">Engineering Reviewer - Electricity and Magnetism Fundamentals</span></td></tr> </tbody></table> <b>Multiple Choice Questions</b><br /> <b>Electricity and Magnetism Fundamentals</b><b>Multiple Choice Questions</b><br /> <b>Electricity and Magnetism Fundamentals</b><br /> <br /> 51.<span class="Apple-tab-span" style="white-space: pre;"> </span>The ratio of the permeability of material to the permiability of air or vacuum.<br /> A. Relative permeability<br /> B. Relative permitivity<br /> C. Relative conductivity<br /> D. Relative reluctivity<br /> <br /> 52.<span class="Apple-tab-span" style="white-space: pre;"> </span>Permeance is analogous to<br /> A. Conductance<br /> B. Reluctance<br /> C. Admittance<br /> D. Resistance<br /> <br /> 53.<span class="Apple-tab-span" style="white-space: pre;"> </span>The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force is known as<br /> A. Retentivity<br /> B. Reluctivity<br /> C. Resistivity<br /> D. Conductivity<br /> <br /> 54.<span class="Apple-tab-span" style="white-space: pre;"> </span>The quantity of magnetism retained by a magnetic material after withdrawal of the magnetizing force is called<br /> A. Leftover magnetism<br /> B. Hysteresis<br /> C. Residual magnetism<br /> D. Coercivity<br /> <br /> 55.<span class="Apple-tab-span" style="white-space: pre;"> </span>The amount of magnetizing force to counter balance the residual magnetism of a magnetic material is referred to as<br /> A. Reluctivity<br /> B. Susceptivity<br /> C. Coercivity<br /> D. Retentivity<br /> <br /> 56.<span class="Apple-tab-span" style="white-space: pre;"> </span>The ratio of the total flux (flux in iron path) to the useful flux (flux in air gap)<br /> A. Leakage flux<br /> B. Leakage current<br /> C. Leakage coefficient<br /> D. Leakage factor<br /> <br /> 57.<span class="Apple-tab-span" style="white-space: pre;"> </span>Defined as the number of lines per unit area through any substance in a plane at right angles to the lines of force<br /> A. Flux<br /> B. Flux lines<br /> C. Flux density<br /> D. Flux intensity<br /> <br /> 58.<span class="Apple-tab-span" style="white-space: pre;"> </span>Defined as the flux density produced in it due to its own induced magnetism<br /> A. Magnetic field intensity<br /> B. Electric field intensity<br /> C. Electromagnetic field intensity<br /> D. Intensity magnetization<br /> <br /> 59.<span class="Apple-tab-span" style="white-space: pre;"> </span>The force acting on a unit n- pole placed at that point is called<br /> A. Magnetic field intensity<br /> B. Electric field intensity<br /> C. Electromagnetic field intensity<br /> D. Intensity magnetization<br /> <br /> 60.<span class="Apple-tab-span" style="white-space: pre;"> </span>The ratio between the intensity of magnetization produced in a substance to the magnetizing force producing it<br /> A. Magnetic Reluctivity<br /> B. Magnetic Resistivity<br /> C. Magnetic susceptibility<br /> D. Magnetic conductivity<br /> <br /> 61.<span class="Apple-tab-span" style="white-space: pre;"> </span>The lagging effect between flux density of the material and the magnetizing force applied<br /> A. Permeance<br /> B. Eddy current<br /> C. Hysteresis<br /> D. Reluctance<br /> <br /> 62.<span class="Apple-tab-span" style="white-space: pre;"> </span>Refers to the magnetic lines<br /> A. Flux<br /> B. Hysteresis<br /> C. Current<br /> D. Magnetomotive force<br /> <br /> 63.<span class="Apple-tab-span" style="white-space: pre;"> </span>Refers to the non- metallic materials that have the ferromagnetic properties of iron.<br /> A. Ferrites<br /> B. Ferromagnetic<br /> C. Diamagnetic<br /> D. Paramagnetic<br /> <br /> 64.<span class="Apple-tab-span" style="white-space: pre;"> </span>The air space between poles of magnets<br /> A. Air gap<br /> B. Free space<br /> C. Vacuum<br /> D. Atmosphere<br /> <br /> 65.<span class="Apple-tab-span" style="white-space: pre;"> </span>One that has magnetic poles produced by internal atomic structure with no external current necessary<br /> A. Diamagnetic<br /> B. Permanent magnets<br /> C. Paramagnetic<br /> D. Electromagnetic<br /> <br /> 66.<span class="Apple-tab-span" style="white-space: pre;"> </span>Magnetic effects of the earth as a huge magnet with north and south poles.<br /> A. Diamagnetic<br /> B. Ferromagnetic<br /> C. Terrestrial magnetism<br /> D. Terrestrial ferromagnetism<br /> <br /> 67.<span class="Apple-tab-span" style="white-space: pre;"> </span>Used to maintain strength of magnetic field<br /> A. Container<br /> B. Air gap<br /> C. Keeper<br /> D. Source<br /> <br /> 68.<span class="Apple-tab-span" style="white-space: pre;"> </span>All magnetic field originates from<br /> A. moving electric charge<br /> B. Iron atoms<br /> C. Magnetic domain<br /> D. Permanent magnets<br /> <br /> 69.<span class="Apple-tab-span" style="white-space: pre;"> </span>Magnetic  fields do not interact with<br /> A. Moving permanent magnets<br /> B. Stationary permanent magnets<br /> C. Moving electric charges<br /> D. Stationary electric charges<br /> <br /> 70.<span class="Apple-tab-span" style="white-space: pre;"> </span>The magnetic field inside a solenoid<br /> A. is zero<br /> B. is uniform<br /> C. increases with distance from the axis<br /> D. decreases with distance from the axis<br /> <br /> 71.<span class="Apple-tab-span" style="white-space: pre;"> </span>When the ferromagnetic substance is inserted in a current- carrying solenoid, the magnetic field is<br /> A. Greatly decreased<br /> B. Greatly increased<br /> C. Slightly decreased<br /> D. Slightly increased<br /> <br /> 72.<span class="Apple-tab-span" style="white-space: pre;"> </span>The magnetic field of a bar magnet most closely resembles the magnetic field of<br /> A. a horseshoe magnet<br /> B. a straight current- carrying wire<br /> C. a stream of electrons moving parallel to one another<br /> D. a current- carrying wire loop<br /> <br /> 73.<span class="Apple-tab-span" style="white-space: pre;"> </span>The magnetic field of a magnetized iron bar when strongly heated<br /> A. Becomes weaker<br /> B. Becomes stronger<br /> C. Reverses in direction<br /> D. is unchanged<br /> <br /> 74.<span class="Apple-tab-span" style="white-space: pre;"> </span>A permanent magnet does not exert a force on<br /> A. an unmagnetized iron bar<br /> B. a magnetized iron bar<br /> C. a moving electric charge<br /> D. a stationary electric charge<br /> <br /> 75.<span class="Apple-tab-span" style="white-space: pre;"> </span>A current if flowing east along a power line. If the earth’s field is neglected, the direction of the magnetic field below it is<br /> A. North<br /> B. South<br /> C. East<br /> D. West<br /> <br /> 76.<span class="Apple-tab-span" style="white-space: pre;"> </span>The emf produced in a wire by its motion across a magnetic field does not depend upon the<br /> A. Diameter of the wire<br /> B. Length of the wire<br /> C. Orientation of the wire<br /> D. Flux density of the field<br /> <br /> 77.<span class="Apple-tab-span" style="white-space: pre;"> </span>The induced emf in a wire loop that is moved parallel to a uniform magnetic field is<br /> A. Zero<br /> B. Dependent on the area of the loop<br /> C. Dependent on the shape of the loop<br /> D. Dependent on the magnitude of the field<br /> <br /> 78.<span class="Apple-tab-span" style="white-space: pre;"> </span>When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every _______ revolution<br /> A. 1/3<br /> B. 1/2<br /> C. 1/4<br /> D. 2/3<br /> <br /> 79.<span class="Apple-tab-span" style="white-space: pre;"> </span>The magnetic flux through a wire loop in a magnetic field does not depend on<br /> A. The area of the loop<br /> B. The magnitude of the field<br /> C. The shape of the loop<br /> D. The angle between the plane of the loop and the direction<br /> <br /> <br /> 80.<span class="Apple-tab-span" style="white-space: pre;"> </span>Steel is hard to magnetize because of its<br /> A. Low permeability<br /> B. High permeability<br /> C. High density<br /> D. High retentivity<span class="Apple-tab-span" style="white-space: pre;"> </span><br /> <br /> 81.<span class="Apple-tab-span" style="white-space: pre;"> </span>Paramagnetic substance has a relative permeability of<br /> A. Slightly less than one<br /> B. Equal to one<br /> C. Slightly equal to one<br /> D. Very much greater than one<br /> <br /> 82.<span class="Apple-tab-span" style="white-space: pre;"> </span>A group of magnetically aligned atoms is called<br /> A. Range<br /> B. Lattice<br /> C. Domain<br /> D. Crystal<br /> <br /> 83.<span class="Apple-tab-span" style="white-space: pre;"> </span>The force between two magnetic poles varies with the distance between them. The variation is ______ to the square of that distance.<br /> A. Equal<br /> B. Greater than<br /> C. Directly proportional<br /> D. Inversely proportional<br /> <br /> 84.<span class="Apple-tab-span" style="white-space: pre;"> </span>Permeability means<br /> A. The conductivity of the material for magnetic lines of force<br /> B. The magnetization test in the material after exciting field has been removed<br /> C. The strength of an electromagnet<br /> D. The strength of the permanent magnet<br /> <br /> 85.<span class="Apple-tab-span" style="white-space: pre;"> </span>______ is an electromagnet with its core in the form of a close magnetic ring.<br /> A. Solenoid<br /> B. Paraboloid<br /> C. Toroid<br /> D. Cycloid<br /> <br /> 86.<span class="Apple-tab-span" style="white-space: pre;"> </span>A magnetic material losses its ferromagnetic properties at a point called<br /> A. Curie temperature<br /> B. Inferred absolute temperature<br /> C. Room temperature<br /> D. Absolute temperature<br /> <br /> 87.<span class="Apple-tab-span" style="white-space: pre;"> </span>Small voltages generated by a conductor with current in an external magnetic field.<br /> A. Skin effect<br /> B. Magnetic effect<br /> C. Hall effect<br /> D. Flywheel Effect<br /> <br /> 88.<span class="Apple-tab-span" style="white-space: pre;"> </span>The emission of electrons from hot bodies is called<br /> A. Radiation effect<br /> B. Edison effect<br /> C. Skin effect<br /> D. Half effect<br /> <br /> 89.<span class="Apple-tab-span" style="white-space: pre;"> </span>The ability of a mechanically stressed ferromagnetic wire to recognize rapid switching of magnetization when subjected to a dc magnetic field.<br /> A. Wartheim effect<br /> B. Wiedemann effect<br /> C. Wiegand effect<br /> D. Edison effect<br /> <br /> 90.<span class="Apple-tab-span" style="white-space: pre;"> </span>An effect which is generally used in the gausameter to measure flux density.<br /> A. Skin effect<br /> B. Magnetic effect<br /> C. Hall effect<br /> D. Flywheel effect<br /> <br /> 91.<span class="Apple-tab-span" style="white-space: pre;"> </span>The contribution to the ionization in an ionization chamber by electrons liberated from the walls.<br /> A. Skin effect<br /> B. Walt effect<br /> C. Hall effect<br /> D. Edison effect<br /> <br /> 92.<span class="Apple-tab-span" style="white-space: pre;"> </span>The tiniest element of matter<br /> A. Atom<br /> B. Proton<br /> C. Electron<br /> D. Neutron<br /> <br /> 93.<span class="Apple-tab-span" style="white-space: pre;"> </span>All matters (gas, liquid and solid) are composed of<br /> A. Neutrons<br /> B. Particles<br /> C. Electrons<br /> D. Atoms<br /> <br /> 94.<span class="Apple-tab-span" style="white-space: pre;"> </span>The simplest type of atom to exist is the ______ atom.<br /> A. Helium<br /> B. Hydrogen<br /> C. Boron<br /> D. Oxygen<br /> <br /> 95.<span class="Apple-tab-span" style="white-space: pre;"> </span>What revolves about the positive nucleus in a definite orbit?<br /> A. Atom<br /> B. Proton<br /> C. Electron<br /> D. Neutron<br /> <br /> 96.<span class="Apple-tab-span" style="white-space: pre;"> </span>The uncharged particles which have no effect on its atomic charge.<br /> A. Nucleons<br /> B. Electrons<br /> C. Protons<br /> D. Neutrons<br /> <br /> 97.<span class="Apple-tab-span" style="white-space: pre;"> </span>The diameter of a hydrogen atom is approximately ______ cm.<br /> A. 1.1 x 10^-6<br /> B. 1.1 x 10^-7<br /> C. 1.1 x 10^-8<br /> D. 1.1 x 10^-9<br /> <br /> 98.<span class="Apple-tab-span" style="white-space: pre;"> </span>The K shell or the first shell has how many permissible number of orbiting electrons?<br /> A. 1<br /> B. 2<br /> C. 3<br /> D. 4<br /> <br /> 99.<span class="Apple-tab-span" style="white-space: pre;"> </span>Germanium atom has ______ protons and ______ electrons.<br /> A. 32, 32<br /> B. 32, 42<br /> C. 42, 32<br /> D. 34, 34<br /> <br /> 100. A germanium atom has an atomic weight of 72. How many neutrons are there?<br /> A. 32<br /> B. 40<br /> C. 34<br /> D. 36<br /> <br /> <br /> Click the download button below to download this practice set <i>with answers</i> in PDF format.<br /> <a href="http://sh.st/g0bLR" target="_blank"><img alt="Engineering Reviewer" border="0" src="http://2.bp.blogspot.com/-_PFABbawQHQ/VA0kf6_YvjI/AAAAAAAAAZI/9qzE0TiS5Qs/s1600/dl.png" /></a>

MCQs / Engineering Reviewer - Electricity and Magnetism Fundamentals Part 2

Engineering Reviewer - Electricity and Magnetism Fundamentals Multiple Choice Questions Electricity and Magnetism Fundamentals Multiple...

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MCQs / Engineering Reviewer - Electricity and Magnetism Fundamentals Part 1

<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="http://2.bp.blogspot.com/-QgDtnOlr1A0/VQunJ9xUFPI/AAAAAAAABI8/prZSaus1tso/s1600/mcqs-electricty-magnetism.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="MCQs on Electricity and Magnetism Fundamentals" border="0" src="http://2.bp.blogspot.com/-QgDtnOlr1A0/VQunJ9xUFPI/AAAAAAAABI8/prZSaus1tso/s1600/mcqs-electricty-magnetism.jpg" title="MCQs on Electricity and Magnetism Fundamentals" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;"><span style="font-size: 12.8000001907349px;">Engineering Reviewer - Electricity and Magnetism Fundamentals</span></td></tr> </tbody></table> <b>Multiple Choice Questions / Practice Test</b><br /> <b>Electricity and Magnetism Fundamentals</b><br /> <br /> 1.<span class="Apple-tab-span" style="white-space: pre;"> </span>Who discovered the relationship between magnetism and electricity that serves as the foundation for the theory of electromagnetism?<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Luigi Galvani<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Hans Christian Oersted<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Andre Ampere<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Charles Coulomb<br /> <br /> 2.<span class="Apple-tab-span" style="white-space: pre;"> </span>Who demonstrated the theory of electromagnetic induction in 1831?<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Michael Faraday<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Andre Ampere<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>James Clerk Maxwell<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Charles Coulomb<br /> <br /> 3.<span class="Apple-tab-span" style="white-space: pre;"> </span>Who developed the electromagnetic theory of light in 1862?<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Heinrich Rudolf Hertz<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Wilhelm Rontgen<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>James Clerk Maxwell<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Andre Ampere<br /> <br /> 4.<span class="Apple-tab-span" style="white-space: pre;"> </span>Who discovered that a current-carrying conductor would move when placed in a magnetic field?<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Michael Faraday<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Andre Ampere<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Hans Christian Oersted<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Gustav Robert Kirchhoff<br /> <br /> 5.<span class="Apple-tab-span" style="white-space: pre;"> </span>Who discovered the most important electrical effects which is the magnetic effect?<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Hans Christian Oersted<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Sir Charles Wheatstone<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Georg Ohm<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>James Clerk Maxwell<br /> <br /> 6.<span class="Apple-tab-span" style="white-space: pre;"> </span>Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying conductors can attract and repel each other just like magnets?<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Luigi Galvani<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Hans Christian Oersted<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Charles Coulomb<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Andre Ampere<br /> <br /> 7.<span class="Apple-tab-span" style="white-space: pre;"> </span>Who discovered superconductivity in 1911?<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Kamerlingh Onnes<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Alex Muller<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Geory Bednorz<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Charles Coulomb<br /> <br /> 8.<span class="Apple-tab-span" style="white-space: pre;"> </span>The magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages. This is known as<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Joule’s Law<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Faraday’s second law of electromagnetic induction<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Faraday’s first law of electromagnetic induction<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Coulomb’s Law<br /> <br /> 9.<span class="Apple-tab-span" style="white-space: pre;"> </span>Whenever a flux inking a coil or current changes, an emf is induced in it. This is known as<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Joule’s Law<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Coulomb’s Law<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Faraday’s first law of electromagnetic induction<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Faraday’s second law of electromagnetic induction<br /> <br /> 10.<span class="Apple-tab-span" style="white-space: pre;"> </span>The force of attraction or repulsion between two magnetic poles is directly proportional to their strengths.<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Newton’s first law<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Faraday’s first law of electromagnetic induction<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Coulomb’s first law<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Coulomb’s second law<br /> <br /> 11.<span class="Apple-tab-span" style="white-space: pre;"> </span>The force of attraction or repulsion between two magnetic poles is inversely proportional to the square of the distance between them. This is known as<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Newton’s first law<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Faraday’s first law of electromagnetic induction<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Coulomb’s first law<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Coulomb’s second law<br /> <br /> 12.<span class="Apple-tab-span" style="white-space: pre;"> </span>Whenever a conductor cuts magnetic flux, an emf is induced in it. This is known as<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Coulomb’s law<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Joule’s law<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Faraday’s law<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Ohm’s law<br /> <br /> 13.<span class="Apple-tab-span" style="white-space: pre;"> </span>A law that states that the polarity of the induced voltage will oppose the change in magnetic flux causing the induction.<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Joule’s law<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Faraday’s law<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Coulomb’s law<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Lenz’ law<br /> <br /> 14.<span class="Apple-tab-span" style="white-space: pre;"> </span>A law that states that the current in a thermionic diode varies directly with the three-halves power of anode voltage and inversely with the square of the distance between the electrodes, provided operating conditions are such that the current is limited only by the space charge.<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Hall’s law<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Joule’s law<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Child’s law<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Coulomb’s law<br /> <br /> 15.<span class="Apple-tab-span" style="white-space: pre;"> </span>States that the ratio of the thermal conductivity is proportional to the absolute temperature for all metals.<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Wien’s displacement law<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Hartleys law<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Hall’s law<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Wiedemann Franz law<br /> <br /> 16.<span class="Apple-tab-span" style="white-space: pre;"> </span>A law establishing the fact that the algebraic su of the rises and drops of the mmf around a closed loop of a magnetic circuit is equal to zero.<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Kirchhoff’s circuital law<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Maxwell’s circuital law<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Ampere’s circuital law<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Coulomb’s circuital law<br /> <br /> 17.<span class="Apple-tab-span" style="white-space: pre;"> </span>The net electrical charge in an isolated system remains constant. This is known as<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Law of conservation of charge<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Coulomb’s first law<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Coulomb’s second law<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Law of conservation of energy<br /> <br /> 18.<span class="Apple-tab-span" style="white-space: pre;"> </span>Lenz’s law is the consequence of the law of conservation of<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Energy<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Charge<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Field lines<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Momentum<br /> <br /> 19.<span class="Apple-tab-span" style="white-space: pre;"> </span>Lenz’ law states that the direction of the induced emf and hence current<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Is determined by the rate of current flux<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Is found by the right hand rule<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Is found by the left hand rule<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Always opposes the cause producing it<br /> <br /> 20.<span class="Apple-tab-span" style="white-space: pre;"> </span>If you hold the conductor with right hand so that the stretched thumb points in the direction of the current, then encircling fingers will give the direction of magnetic lines of force round the conductor. This is known as<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Left hand cork screw rule<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Right hand cork screw rule<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Left hand rule<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Right hand rule<br /> <br /> 21.<span class="Apple-tab-span" style="white-space: pre;"> </span>If the right handed bottle-opener cork screw is assumed to be along the conductor so as to advance in the direction of current flow, the motion of its handle will indicate the direction of magnetic flux produced around the conductor. This is known as<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Right hand rule<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Left hand rule<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Cork screw rule<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>End rule<br /> <br /> 22.<span class="Apple-tab-span" style="white-space: pre;"> </span>If on looking at any one end of a solenoid; the direction of current flow is found to be clockwise then the end under observation is a south pole. This is known as<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Right hand rule<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Left hand rule<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Cork screw rule<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>End Rule<br /> <br /> 23.<span class="Apple-tab-span" style="white-space: pre;"> </span>If the solenoid is gripped by the right hand with the fingers pointing the direction of current flow, the outstretched thumb will then point the north pole. This is known as<br /> A. Right hand rule<br /> B. Helix rule<br /> C. End rule<br /> D. Cork screw rule<br /> <br /> 24.<span class="Apple-tab-span" style="white-space: pre;"> </span>The process by which an emf and hence current is generated or induced  in a conductor when there is a change in the magnetic flux linking the conductor is called<br /> A. Electromagnetic induction<br /> B. Mutual induction<br /> C. Faraday’s law<br /> D. Electromagnetic interference<br /> <br /> 25.<span class="Apple-tab-span" style="white-space: pre;"> </span>The emf induced in a coil due to the change of its own flux linked with it is called<br /> A. Mutually induced emf<br /> B. Dynamically induced emf<br /> C. Statically induced emf<br /> D. Self induced emf<br /> <br /> 26.<span class="Apple-tab-span" style="white-space: pre;"> </span>The emf induced in a coil due to the changing current of another neighboring coil is called<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Mutually induced emf<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Self induced emf<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Statically induced emf<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Dynamically induced emf<br /> <br /> 27.<span class="Apple-tab-span" style="white-space: pre;"> </span>When a conductor is stationary and the magnetic field is moving or changing the emf induced is called<br /> A. Statically induced emf<br /> B. Mutually induced emf<br /> C. Self induced emf<br /> D. Dynamically induced emf<br /> <br /> 28.<span class="Apple-tab-span" style="white-space: pre;"> </span>The magnetic potential in a magnetic circuit can be measured in terms of<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Mmf<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Emf<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Farad<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>Coulomb<br /> <br /> 29.<span class="Apple-tab-span" style="white-space: pre;"> </span>A substance that attracts pieces iron<br /> A.<span class="Apple-tab-span" style="white-space: pre;"> </span>Conductor<br /> B.<span class="Apple-tab-span" style="white-space: pre;"> </span>Semiconductor<br /> C.<span class="Apple-tab-span" style="white-space: pre;"> </span>Magnet<br /> D.<span class="Apple-tab-span" style="white-space: pre;"> </span>All of the above<br /> <br /> 30.<span class="Apple-tab-span" style="white-space: pre;"> </span>The phenomenon by which a subtracts pieces of iron<br /> A. Magnetism<br /> B. Electromagnetism<br /> C. Naturalism<br /> D. Materialism<br /> <br /> 31.<span class="Apple-tab-span" style="white-space: pre;"> </span>Which of the following is a natural magnet?<br /> A. Steel<br /> B. Magnesia<br /> C. Lodestone<br /> D. Soft iron<br /> <br /> 32.<span class="Apple-tab-span" style="white-space: pre;"> </span>Define as that pole which when placed in air from a similar and equal pole repels it with a force of newtons<br /> A. North pole<br /> B. South pole<br /> C. Unit pole<br /> D. Magnetic pole<br /> <br /> 33.<span class="Apple-tab-span" style="white-space: pre;"> </span>The point in a magnet where the intensity of magnetic lines of force is maximum<br /> A. Magnetic pole<br /> B. South pole<br /> C. North pole<br /> D. Unit pole<br /> <br /> 34.<span class="Apple-tab-span" style="white-space: pre;"> </span>The straight line passing through the two poles of magnet is called<br /> A. Real axis<br /> B. Cartesian axis<br /> C. Magnetic axis<br /> D. Imaginary axis<br /> <br /> 35.<span class="Apple-tab-span" style="white-space: pre;"> </span>The branch of Engineering which deals with the magnetic effect of electric current is known as<br /> A. Magnetism<br /> B. Electromagnetism<br /> C. Electrical engineering<br /> D. Electronics engineering<br /> <br /> 36.<span class="Apple-tab-span" style="white-space: pre;"> </span>The space outside the magnet where its pole have a force of attraction or repulsion on a magnetic pole is called<br /> A. Magnetic field<br /> B. Electric field<br /> C. Electromagnetic field<br /> D. Free Space Field<br /> <br /> 37.<span class="Apple-tab-span" style="white-space: pre;"> </span>The total number of magnetic lines of force in a magnetic field is called<br /> A. Magnetic flux<br /> B. Magnetic flux density<br /> C. Magnetic flux intensity<br /> D. Magnetic potential<br /> <br /> 38.<span class="Apple-tab-span" style="white-space: pre;"> </span>The phenomenon by which a magnetic substance becomes a magnet when it is place near a magnet<br /> A. Magnetic effect<br /> B. Magnetic phenomenon<br /> C. Magnetic induction<br /> D. Electromagnetic induction<br /> <br /> 39.<span class="Apple-tab-span" style="white-space: pre;"> </span>Which of the following magnetic materials can be easily magnetized in both direction?<br /> A. Soft magnetic materials<br /> B. Hard magnetic materials<br /> C. High hysteresis loss materials<br /> D. Low hysteresis loss materials<br /> <br /> 40.<span class="Apple-tab-span" style="white-space: pre;"> </span>Which of the following materials has permeability slightly less than that of free space?<br /> A. Paramagnetic<br /> B. Non- magnetic<br /> C. Ferromagnetic<br /> D. Diamagnetic<br /> <br /> 41.<span class="Apple-tab-span" style="white-space: pre;"> </span>Materials whose permeabilities are slightly greater than that of free space<br /> A. Paramagnetic<br /> B. Non- magnetic<br /> C. Ferromagnetic<br /> D. Diamagnetic<br /> <br /> 42.<span class="Apple-tab-span" style="white-space: pre;"> </span>Materials that have very high permeabilities (hundreds and even thousands times of that of free space)<br /> A. Paramagnetic<br /> B. Non- magnetic<br /> C. Ferromagnetic<br /> D. Diamagnetic<br /> <br /> 43.<span class="Apple-tab-span" style="white-space: pre;"> </span>The current of electric circuit is analogous to which quantity of a magnetic circuit<br /> A. Mmf<br /> B. Flux<br /> C. Flux density<br /> D. Reluctivity<br /> <br /> 44.<span class="Apple-tab-span" style="white-space: pre;"> </span>What is the diameter of an atom?<br /> A. About 10^-10 m<br /> B. About 10^-10 cm<br /> C. About 10^-10 mm<br /> D. About 10^-10 µm<br /> <br /> 45.<span class="Apple-tab-span" style="white-space: pre;"> </span>Defined as a closed path in which magnetic induction or flux flows<br /> A. Electric circuit<br /> B. Magnetic circuit<br /> C. Electronic circuit<br /> D. Electromagnetic circuit<br /> <br /> 46.<span class="Apple-tab-span" style="white-space: pre;"> </span>The force which set ups or tends to set up magnetic flux in a magnetic circuit<br /> A. Dynamic force<br /> B. Electromotive force<br /> C. Potential difference<br /> D. Magnetomotive force<br /> <br /> 47.<span class="Apple-tab-span" style="white-space: pre;"> </span>Referred to as the specific reluctance of a material<br /> A. Resistivity<br /> B. Reluctivity<br /> C. Conductivity<br /> D. Permeability<br /> <br /> 48.<span class="Apple-tab-span" style="white-space: pre;"> </span>The property of a material which opposes the creation of magnetic flux in it<br /> A. Resistance<br /> B. Reluctance<br /> C. Permeance<br /> D. Conductance<span class="Apple-tab-span" style="white-space: pre;"> </span><br /> <br /> 49.<span class="Apple-tab-span" style="white-space: pre;"> </span>It is the reciprocal of reluctance and implies the case of readiness with which magnetic flux is developed.<br /> A. Resistance<br /> B. Conductance<br /> C. Permeance<br /> D. Inductance<br /> <br /> 50.<span class="Apple-tab-span" style="white-space: pre;"> </span>The ability of a material to conduct magnetic flux through it.<br /> A. Permittivity<br /> B. Reluctivity<br /> C. Conductivity<br /> D. Permeability<br /> <br /> <br /> Click the download button below to download this practice set <i>with answers</i> in PDF format.<br /> <a href="http://sh.st/g0bHn" target="_blank"><img alt="Engineering Reviewer" border="0" src="http://2.bp.blogspot.com/-_PFABbawQHQ/VA0kf6_YvjI/AAAAAAAAAZI/9qzE0TiS5Qs/s1600/dl.png" /></a>

MCQs / Engineering Reviewer - Electricity and Magnetism Fundamentals Part 1

Engineering Reviewer - Electricity and Magnetism Fundamentals Multiple Choice Questions / Practice Test Electricity and Magnetism Funda...

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