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Electric Circuits MCQs | Electric Circuits Multiple Choice Questions(MCQs) with Answers

61 What will be the equivalent conductance G of the circuit shown below. G1, G2 and G3 are the conductance of individual circuit branch
[A] G = G1 + G2 + G3
[B] 1/G = G1 + G2 + G3
[C] 1/G = 1/G1 + 1/G2 + 1/G3
[D] G = 1/G1+G2+G3
Answer: G = G1 + G2 + G3
62 Which of the following conditions is true for even function?
[A] ƒ(t) = - ƒ(n + T/2)
[B] ƒ(t) = - ƒ(t)
[C] ƒ(t) = ƒ(-t)
[D] ƒ(t) = ƒ(t)
Answer: ƒ(t) = ƒ(-t)

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63 The Fourier series expansion of an odd periodic function contains
[A] Cosine terms
[B] Constant terms only
[C] Sine terms
[D] Cosec terms only
Answer: Sine terms
64 The phasors for which of the following pair are 180° out of phase for VL, VC and VR ?
[A] VL and VR
[B] VC and VR
[C] VC and VL
[D] none of the above
Answer: VC and VL
65 The magnitude of the impedance 20-15j is given by
[A] 5 Ω
[B] 15 Ω
[C] 25 Ω
[D] 625 Ω
Answer: 25 Ω
66 If resistance is 10Ω and inductance is 1 H in an RL series circuit. What will be the time constant of this series RL circuit?
[A] 10 second
[B] 0.1 second
[C] 100 second
[D] 0.001 second
Answer: 0.1 second
67 Which of the following statement is true?
[A] A Norton equivalent is series circuit
[B] A Thevenin equivalent is a parallel circuit
[C] Resistive circuit is a dual pair
[D] R-L circuit is a dual pair
Answer: Resistive circuit is a dual pair
68 The time constant of a series RC circuit is given by
[A] RC
[B] R/C
[C] R2C
[D] RC2
Answer: RC
69 A pulse of T seconds width is applied to an RC circuit. What kind of circuit will be required to produce a ramp response ?
[A] Low pass filter with low time constant
[B] Low pass filter with high time constant
[C] An integrator
[D] (b) or (c)
Answer: (b) or (c)
70 The expression £ (t) = n1/sn+1 is true the function
[A] ƒ(t) = tn
[B] ƒ(t) = ntn
[C] ƒ(t) = t/n
[D] ƒ(t) = tn
Answer: ƒ(t) = tn
71 Whish of the following is the Laplace transform of ƒ(t) = t ?
[A] 1/s
[B] 1/s2
[C] 1/s3
[D] S
Answer: 1/s
72 The Laplace transform of the function ƒ(t) = sin⁡βt is given by
[A] β/s+β2
[B] β/s2+β2
[C] s/s2+β2
[D] β2/s+β
Answer: β/s+β2
73 The Laplace transform of the function ƒ(t) = E-at is given by
[A] 1/a2+ s2
[B] 1/a+s
[C] 1/a+s
[D] s2/a2+ s2
Answer: 1/a+s
74 The Laplace transform of the unit function is given by
[A] 1/s
[B] 1/s2
[C] S
[D] 1
Answer: 1/s
75 An RC network is shown blow, can be used as high pass and low pass filter as well. For which of the condition lower cut-off frequency occurs as high pass filter ?
[A] ES = ER
[B] ES+ EC
[C] ER=0.707 EC
[D] ER= 0.707 ES
Answer: ER= 0.707 ES
76 In the vector diagrams shown in Q.160, diagram (a) corresponds to
[A] Pure inductive circuit
[B] Pure resistive circuit
[C] Pure resistive circuit
[D] None of the above
Answer: Pure resistive circuit
77 In the above question, if the capacitors are connected in parallel, what will be the net capacitance ?
[A] 40 μF
[B] 20 μF
[C] 10 μF
[D] 30 μF
Answer: 40 μF
78 If two capacitors with 20 μF capacitance each are connected in series. What will be the net capacitance of the circuit ?
[A] 10 μF
[B] 20 μF
[C] 40 μF
[D] 80 μF
Answer: 10 μF
79 For which of the following parameter variation, the capacitance of the capacitor remains unaffected ?
[A] Nature of dielectric
[B] Thickness of the plates
[C] Distance between the plates
[D] Area of the plates
Answer: Thickness of the plates
80 If the effective voltage of the sinusoidal voltage is 11 volts. What will be the average value of sinusoidal voltage ?
[A] 5 volts
[B] 10 volts
[C] 1.1 volts
[D] 11 volts
Answer: 10 volts

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