Engineering Reviewer - Electrical Circuits |

**Multiple Choice Questions / Practice Test**

**Electrical Circuits**

101. The potential gradient in a cable is maximum in

A. Conductor

B. Outer sheath

C. Insulation

D. Uniformly all over

102. The Q-factor of a parallel resonant circuit is also known as

A. Current magnification factor

B. Voltage magnification factor

C. Load factor

D. Leakage factor

103. The Q-factor of a series resonant circuit is also known as

A. Current magnification factor

B. Voltage magnification factor

C. Load factor

D. Leakage factor

104. What is the form factor of a triangular wave?

A. 1.16

B. 1.11

C. 1.73

D. 1.41

105. In a rectangular wave, the form factor is

A. 1.11

B. 1.16

C. 1.0

D. 1.73

106. Which of the following dielectric materials makes the highest-capacitance capacitor?

A. Air

B. Barium-strontium titanite

C. Mica

D. Electrolyte

107. In a circuit, an active element is one which

A. Supplies energy

B. Receives energy

C. Both supplies and receives energy

D. Amplifies signal

108. An electric circuit contains

A. Passive elements

B. Active elements

C. Both active and passive elements

D. Reactive elements

109. What is the hot resistance of a 100 W, 220 V incandescent lamp?

A. 2.2 Ω

B. 22 Ω

C. 484 Ω

D. 4.84 Ω

110. Which statement is true about a passive circuit?

A. A circuit with neither a source of current nor a source of potential difference

B. A circuit with a voltage source

C. A circuit with a current source

D. A circuit with only resistance as a load

111. What is a closed path made of several branches of the network called?

A. Junction

B. Node

C. Terminal

D. Loop

112. The internal resistance of an ideal voltage source is

A. Infinite

B. Equal to the load resistance

C. Zero

D. To be determined

113. What is the conductance of a circuit having three 10 Ω resistors in parallel?

A. 0.3 S

B. 3.33 S

C. 0.33 S

D. 30 S

114. Electric energy refers to

A. Volt divided by coulomb

B. Volt-ampere

C. Volt-coulomb

D. Watt divided by time

115. A capacitor requires 12 μC of charge to raise its potential of 3 V. What is the capacitance of the capacitor?

A. 36 μF

B. 15 μF

C. 0.25 μF

D. 4 μF

116. A capacitor opposes change in

A. Voltage

B. Current

C. Voltage and current

D. Neither voltage nor current

117. What is the total resistance of a two equal valued resistors in series?

A. The difference of both

B. The product of both

C. Twice as one

D. The sum of their reciprocals

118. The ratio of maximum value to the effective value of an alternating quantity is called

A. Form factor

B. Peak factor

C. Dynamic factor

D. Leakage factor

119. For series capacitors, total charge is

A. The sum of individual charges

B. Equal to the charge of either capacitors

C. Equal to the product of the charges

D. The quotient of the charges

120. Series resonant circuit is sometimes known as

A. Rejector circuit

B. Acceptor circuit

C. Inductive circuit

D. Capacitive circuit

121. Parallel resonant circuit is sometimes called as

A. Acceptor circuit

B. Rejector circuit

C. Inductive circuit

D. Capacitive circuit

122. When two pure sine waves of the same frequency and the same amplitude which are exactly 180˚ out-of-phase are added together, the result is

A. A wave with twice the amplitude

B. A wave with half the amplitude

C. Zero signal

D. A wave with twice the frequency

123. If two complex conjugates are added, ___ components results.

A. In-phase

B. Quadrature

C. Complex

D. Out-of-phase

124. If an emf in circuit A produces a current in circuit B, then the same emf in circuit B produces the same current in circuit A. this theorem is known as

A. Maximum power transfer theorem

B. Millman’s theorem

C. Reciprocity theorem

D. Norton’s theorem

125. According to Gauss theorem, flux can be equated to

A. Charge

B. Field intensity

C. Current

D. Voltage

126. An open resistor when checked with an ohmmeter reads

A. Zero

B. Infinite

C. High but within the tolerance

D. Low but not zero

127. Norton’s theorem is ____ Thevenin’s theorem.

A. The same as

B. The converse of

C. Older that

D. More accurate than

128. What value of R is needed with a 0.05 μF C for an RC time constant of 0.02 s?

A. 400 Ω

B. 400 MΩ

C. 400 GΩ

D. 400 kΩ

129. Which of the following is the statement of Ohm’s law?

A. Electric current is directly proportional to both voltage and resistance

B. Electric current varies directly as the voltage and inversely as the resistance

C. Electrical power is directly proportional to the resistance and inversely as the current squared

D. Electrical power is directly proportional to both voltage squared and the resistance

130. The admittance of a parallel RLC circuit is found to be the ___ sum of conductance and susceptances.

A. Algebraic

B. Arithmetic

C. Vector

D. Phasor

131. A wire of one kilometre length has a resistance of 20 Ω. If the length is halved, then the new resistance is ___ the original resistance.

A. Half

B. Twice

C. One-fourth

D. Three times

132. A series-parallel combination of identical resistors will

A. Increase the power rating compared with one resistor alone

B. Increase the voltage rating compared with one resistor alone

C. Reduce the voltage rating compared with resistor alone

D. Result in an expensive circuit

133. The ___ of an alternating quantity is defined as the fractional part of a period or cycle through which the quantity has advanced from selected origin.

A. Phase

B. Frequency

C. Amplitude

D. Waveform

134. An inductive circuit of resistance 16.5 Ω and inductance of 0.14 H takes a current of 25 A. if the frequency is 50 Hz, find the supply voltage.

A. 1501 V

B. 1174 V

C. 1877 V

D. 991 V

135. Which of the following has a positive temperature coefficient?

A. Mica

B. Manganin

C. Silicon

D. Carbon

136. The ratio of the flux density to the electric field intensity in the dielectric is called

A. Permittivity

B. Field intensity

C. Permeability

D. Elasticity

137. It is impossible to change the voltage across a capacitor instantly, as this would produce ___ current.

A. Infinite

B. Zero

C. Low

D. High

138. Which of the following is not a factor affecting capacitance of a basic capacitor?

A. Area of plates

B. Number of plates

C. Distance between plates

D. Dielectric material used

139. When voltage is applied across a ceramic dielectric the electrostatic field produced is 50 times greater than air dielectric. The dielectric constant of ceramic therefore is

A. 50

B. 100

C. 16.67

D. 5

140. The reason why alternating current can induce voltage is

A. It has high peak value

B. It has a stronger magnetic field than direct current

C. It has a constant magnetic field

D. It has a varying magnetic field

141. When two unequal values of resistors are connected in parallel across a dc source, greater current flows through the

A. Higher resistance

B. Lower resistance

C. Higher wattage resistance

D. Lower wattage resistance

142. A real current source has

A. Infinite internal resistance

B. Zero internal resistance

C. Large internal resistance

D. Small internal resistance

143. What is the cross-sectional are of a conductor whose diameter is 0.001 inch?

A. One micron

B. One angstrom

C. One steradian

D. One circular mil

144. Which of the following describes the action of a capacitor?

A. Stores electrical energy

B. Opposes changes in current flow

C. Creates a dc resistance

D. Converts ac to dc

145. High resistance values are a consequence of the ___ of the film.

A. Thickness

B. Length

C. Thinness

D. Area

146. For parallel capacitors, total charge is

A. The sum of individual charges

B. Equal to the charge of either capacitors

C. Equal to the product of the charges

D. The quotient of the charges

147. Which waveform in which the rms value and the mean value are equal?

A. Square wave

B. Triangular wave

C. Sine wave

D. Sawtooth

148. In a series circuit with unequal resistances the

A. Highest R has the highest V

B. Lowest R has the highest V

C. Lowest R has the highest I

D. Highest R has the highest I

149. In a parallel bank with unequal branch resistances

A. The highest R has the highest I

B. The lowest R has the highest V

C. The lowest R has the highest V

D. The highest R has the highest V

150. A rheostat is a form of

A. Variable resistor

B. Variable capacitor

C. Potentiometer

D. Thermocouple

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