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Free download in PDF Electric Circuits MCQs & 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.
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°
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 cosϕ
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
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
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
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
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 )
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
93
The power factor of a purely resistive circuit will be
[A]
unity
[B]
zero
[C]
infinity
[D]
0.5
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
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
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
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
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
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
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