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Multiple Choice Question (MCQ) of Measurements page-20


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191. A rectifier type instrument is used to measure d.c. voltage of 220V. What will the instrument indicate?

a) 220 V
b) 110 V
c) 178 V
d) 0 V

Ans: (d)

192. If a circuit has inductance of 20 H and 10 Ω resistance, after how many seconds the current will attain 63% of the steady state value which is 24 A?

a) 20 seconds
b) 2 seconds
c) 1 second
d) 0.02 second

Ans: (b)

193. Which of the methods can be used to measure the unbalance load of three-phase system?

a) One wattmeter method
b) Two wattmeter method
c) Three voltmeter method
d) Three ammeter method

Ans: (b)

194. The one wattmeter method can only be used to measure balance load of the three phase electric system.

a) True
b) False

Ans: (a)

195. The wattmeter is connected in the three phase balanced circuit as shown. The wattmeter will indicate

a) Active power
b) Wattles power
c) Reactive power
d) (b) or (c)

Ans: (d)

196. The induction testing method is used to find which of the following fault in the cables?

a) Short circuit fault
b) Earth fault
c) Open circuit fault
d) (b) or (c)

Ans: (b)

197. The breakdown of the insulation of the cable will be termed as

a) Earth fault
b) Short circuit fault
c) Open circuit fault
d) (a) or (c)

Ans: (a)

198. loop tests are applied to find the

a) Ground fault of the cable
b) Open circuit fault of the cable
c) Short circuit fault of the cable
d) (a) or (c)

Ans: (d)

199. The stroboscopic method can be used to measure the rotational speed of the electrical drives.

a) True
b) False

Ans: (a)

200.The power factor meter have

a) Only current coil
b) Only voltage coil
c) Current and voltage coils both
d) Only inductive voltage circuit
e) Only inductive current circuit

Ans: (c)

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