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

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Questions
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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