# Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-13

181. 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

Ans: (b)

182.The power factor of a purely resistive circuit will be

a) unity
b) zero
c) infinity
d) 0.5

Ans: (a)

183. The quality factor of RCL circuit will increase if the

a) R decreases
b) R increases
c) Voltage increases
d) Impedance increases

Ans: (a)

184.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

Ans: (b)

185. The inductance across the points AB in the circuit shown is given by

a) 1
b) 2
c) 3
d) 5
e) 4

Ans: (d)

186. 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

Ans: (c)

187. 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

Ans: (c)

188. 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
e) 0.63 V

Ans: (b)

189. 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
c) V/√3

Ans: (a)

190. In the figure of Q. 188, what will be the voltage uC at t = 0?

a) 0
b) V
c) 0.37 V
d) 0.63 V

Ans: (a)

191. In the figure of Q. 188, what will be the voltage uC at t = ∞?

a) V
b) 0
c) V/√3
d) 0.63 V

Ans: (a)

192. A pulse of width T seconds is applied to an RC circuit. The response of the circuit is shown below. Which kind of filter circuit will produce this response?

a) Low pass filter
b) High pass filter
c) Medium pass filter
d) None of the above

Ans: (a)

193. If the output signal of a circuit appropriate the time integral of the input signal, such circuit is called

a) Differentiator
b) Integrator
c) Multiplier
d) Divider

Ans: (b)

194. A pulse of T seconds width is applied to an RC circuit-produces the following response. What kind of filter will generate such response?

a) Low pass filter
b) High pass filter
c) Medium pass filter
d) None of the above

Ans: (b)

195. 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) A differentiator
e) (b) or (c)

Ans: (e)

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