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Free download in PDF Electric Circuits Multiple Choice Questions with Answers for competitive exams. These short objective type questions with answers are very important for competitive exams like IIT-JEE, NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries.
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
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)
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
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
65
The magnitude of the impedance 20-15j is given by
[A]
5 Ω
[B]
15 Ω
[C]
25 Ω
[D]
625 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
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
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)
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
71
Whish of the following is the Laplace transform of ƒ(t) = t ?
[A]
1/s
[B]
1/s2
[C]
1/s3
[D]
S
72
The Laplace transform of the function ƒ(t) = sinβt is given by
[A]
β/s+β2
[B]
β/s2+β2
[C]
s/s2+β2
[D]
β2/s+β
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
74
The Laplace transform of the unit function is given by
[A]
1/s
[B]
1/s2
[C]
S
[D]
1
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
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
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
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
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