Circuit Theory Quiz | Circuit Theory Objective Type Questions and Answers

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Questions
21 The time constant of the capacitance circuit is defined as the time during which voltage
A falls to 36.8% of its final steady value
B rises to 38.6% of its final steady value
C rises to 63.2% of its final steady value
D none of the above

Answer: rises to 63.2% of its final steady value
22 Power factor of the system is kept high
A to reduce line losses
B to maximise the utilization of the capacities of generators, lines and transformers
C to reduce voltage regulation of the line
D due to all above reasons

Answer: due to all above reasons
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23 Power factor of the following circuit will be unity
A inductance
B capacitance
C resistance
D none of these

Answer: resistance
24 Power factor of the following circuit will be zero
A resistance
B inductance
C capacitance
D both (b) and (c)

Answer: both (b) and (c)
25 In a highly capacitive circuit the
A apparent power is equal to the actual power
B reactive power is more than the apparent power
C reactive power is more than the actual power
D actual power is more than its reactive power

Answer: reactive power is more than the actual power
26 Power factor of an inductive circuit is usually improved by connecting capacitor to it in
A parallel
B series
C either (a) or (b)
D none of the above

Answer: parallel
27 Time constant of an inductive circuit
A increases with decrease of inductance and increase of resistance
B increases with decrease of inductance and decrease of resistance
C increases with increase of inductance and decrease of resistance
D increases with the increase of inductance and the increase of resistance

Answer: increases with increase of inductance and decrease of resistance
28 All the rules and laws of D.C. circuit also apply to A.C. circuit containing
A capacitance only
B inductance only
C resistance only
D all above

Answer: resistance only
29 Inductance affects the direct current flow
A only at the time of turning off
B only at the time of turning on
C at the time of turning on and off
D at all the time of operation

Answer: at the time of turning on and off
30 Pure inductive circuit
A consumes some power on average
B does not take power at all from a line
C takes power from the line during some part of the cycle and then returns back to it during other part of the cycle
D none of the above

Answer: takes power from the line during some part of the cycle and then returns back to it during other part of the cycle
31 In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value
A will change the maximum value of current at resonance
B will change the resonance frequency
C will change the impedance at resonance frequency
D will increase the selectivity of the circuit

Answer: will increase the selectivity of the circuit
32 Capacitors for power factor correction are rated in
A kW
B kVA
C kV
D kVAR

Answer: kVAR
33 Poor power factor
A reduces load handling capability of electrical system
B results in more power losses in the electrical system
C overloads alternators, transformers and distribution lines
D results in all above

Answer: results in all above
34 The best place to install a capacitor is
A very near to inductive load
B across the terminals of the inductive load
C far away from the inductive load
D any where

Answer: across the terminals of the inductive load
35 Power factor of an electrical circuit is equal to
A R/Z
B cosine of phase angle difference be-tween current and voltage
C kW/kVA
D all above

Answer: all above
36 In a series resonant circuit, the impedance of the circuit is
A minimum
B maximum
C zero
D none of the above

Answer: minimum
37 Capacitive reactance is more when
A capacitance is less and frequency of supply is less
B capacitance is less and frequency of supply is more
C capacitance is more and frequency of supply is less
D capacitance is more and frequency of supply is more

Answer: capacitance is less and frequency of supply is less
38 The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of______degrees.
A 90
B 60
C 45
D 30

Answer: 45
39 The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that
A both waves must have same frequency
B both waves must have identical peak values
C both waves must have zero value at the same time
D none of the above

Answer: both waves must have same frequency
40 Pure inductive circuit takes power from the A.C. line when
A applied voltage decreases but current increases
B applied voltage increases but current decreases
C both applied voltage and current increase
D both applied voltage and current decrease

Answer: applied voltage decreases but current increases

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