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Multiple Choice Question (MCQ) of Power Systems page-17


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181. corona loss in the power lines is more in winter season than the summer season.

a) True
b) False

Ans: (a)

182. The single phasing relays are used for the protection of

a) Single phase motor only
b) Two-phase motors only
c) Two single phase motor running in parallel
d) Three phase motors

Ans: (d)

183. Two protection zone in the electrical transmission system is decided

a) Location of PT
b) Location of CT
c) Relay’s size
d) Relay’s sensitivity

Ans: (b)

184. Which of the following device will receive Voltage Surge first traveling on the transmission line

a) Step-down transformer
b) Relays
c) Switchgear
d) Lightning arresters

Ans: (d)

185. The fault impedance of the line is

a) Less than the impedance of healthy line
b) More than the impedance of healthy line
c) Equal to the impedance of the healthy line
d) None of the above

Ans: (a)

186. Which of the following parameter can be neglected for a short line?

a) Resistance
b) Inductance
c) Reactance
d) Capacitance

Ans: (d)

187. The stability of a salient pole alternators is better than the stability of a non- salient pole alternators.

a) True
b) False

Ans: (a)

188. Series reactors should have

a) High resistance
b) Low resistance
c) High impedance
d) Low impedance

Ans: (b)

189. Which of the following frequency variation for power frequency is as per IS?

a) 2.5%
b) 5%
c) ±5%
d) ±2.5%

Ans: (c)

190. Which of the following device will be preferred to control the power system voltage?

a) Transformers
b) Shunt capacitors
c) Series capacitors
d) Electronic amplifiers
e) Synchronous conductors

Ans: (e)


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