Electric Circuits MCQs | Electric Circuits MCQs & Answers for competitive exams

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Questions
81 If a conductor is put in a magnetic field, at what angle the conductor should cut the magnetic field to induce maximum current in it ?
A 10°
B 20°
C 90°
D 120°

Answer: 90°
82 Which of the following expression is true for apparent power in an AC circuit ?
A Vr.m.s.×Ir.m.s.
B Vmean×Imean
C Vpeak×Ipeak
D V I cos⁡ϕ

Answer: Vr.m.s.×Ir.m.s.
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83 The power dissipation in the pure capacitance of RC circuit will be
A Zero
B Small
C Higher than dissipation in resistance
D Equal to dissipation in resistance

Answer: Zero
84 Which of the following expression is correct for series reactance Xcs if three capacitors C1, C2 and C3 are connected in series?
A 1/Xcs = 1/Xc1 + 1/Xc2 + 1/Xc3
B Xcs = Xc1 + Xc2 + Xc3
C Xcs = 1/Xc1 + 1/Xc2 + 1/Xc3
D Xcs = 1/Xc1 + Xc2+ Xc3

Answer: Xcs = Xc1 + Xc2 + Xc3
85 An peak value of the sinusoidal voltage is 10 volts. What will be the effective of voltage ?
A 14.14 volts
B 1.414 volts
C 0.707 volts
D 7.07 volts

Answer: 7.07 volts
86 An inductance coil of 10 H develops the counter voltage of 50 volts. What should be the rate change of current in the coil ?
A 5 A/sec
B 10 A/sec
C 1 A/sec
D 100 A/sec

Answer: 5 A/sec
87 The voltage source of 220 V shown in the figure will deliver the total current to the circuit of
A 4 A
B 2 A
C 50 A
D 100 A

Answer: 50 A
88 The four bulbs of 40 watts each are connected in series with a battery across them, which of the following statements is true?
A The voltage across each bulb is same
B The power dissipation in each bulb is not same
C The current through each bulb is same
D None of the above

Answer: The current through each bulb is same
89 The current in the loaded battery flows from
A + ve to – ve plate
B – ve to + ve plate
C Between plates
D Between terminals

Answer: – ve to + ve plate
90 In the given circuit, the Kirchhoff’s current law at the point A is applied. Which of the following relation is correct
A I1 = I2- I3
B I1 - I3+ I3=0
C I1- (I2+ I3 )=0
D I1= -(I2+ I3 )

Answer: I1- (I2+ I3 )=0
91 If the diameter of a current carrying conductor is doubled, the resistance will
A Be reduced to half
B To reduced to one-fourth
C Remain same
D Be doubled

Answer: To reduced to one-fourth
92 The quality factor of RCL circuit will increase if the
A R decreases
B R increases
C Voltage increases
D Impedance increases

Answer: R decreases
93 The power factor of a purely resistive circuit will be
A unity
B zero
C infinity
D 0.5

Answer: unity
94 Which of the following operations is to be carried on to get ramp function from unit impulse at t = 0 ?
A integrate unit impulse function once
B integrate unit impulse function twice
C integrate unit impulse function thrice
D differentiate unit impulse function twice

Answer: integrate unit impulse function thrice
95 For which of the following function the Laplace will be 2/s2
A ƒ(t) = t
B ƒ(t) = 1
C ƒ(t) = δt
D ƒ(t) = t2

Answer: ƒ(t) = t2
96 Which of the following function represents parabolic characteristics?
A ƒ(t) = t
B ƒ(t) = t2
C ƒ(t) = e-at
D ƒ(t) = Ut

Answer: ƒ(t) = t2
97 A pure inductance is connected with DC source as shown. The inductance will behave as
A Open circuit
B Closed circuit
C Short circuit
D None of the above

Answer: Short circuit
98 A voltage divider and its Thevenin’s equivalent circuit is shown below. What will be the value of voltage source V and resistance R.
A 10 V, 80 Ω
B 10 V, 120 Ω
C 4 V, 48 Ω
D 5 V, 50 Ω

Answer: 4 V, 48 Ω
99 In the circuit shown below, what will be the voltage uR at t = 0?
A 0
B V
C V/2
D 0.37 V

Answer: V
100 In the figure of Q. 188, what will be the voltage uR at t = ∞?
A 0
B V
C 0.37 V
D 0.63 V

Answer: 0

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