Electrical and Electronics Measurement Mcq

61. A rectifier instrument is used to measure an alternating square wave of amplitude 100 V. What is the meter reading ?

(a) 100 V
(b) 70.7 V
(c) 111 V
(d) None of the above.

62. Which of the following meters does not exhibit square law response?

(a) Moving coil
(b) Moving iron.
(c) Electrodynamometer.
(d) Hot wire instrument.

63. Which one of the following instruments is commonly used to measure primary current of a transformer connected to mains ?

(a) Electrostatic meter.
(b) Current transformer.
(c) Moving coil type meter.
(d) Moving iron meter.

64. For a given frequency, the deflecting torque of an induction ammeter is directly proportional to

(a) current².
(b) current³.
(c) √current.
(d) current.

65. Induction type instruments are not usually used as ammeters and voltmeters because

(a) their indications are affected by stray magnetic field considerably.
(b) variation in supply frequency and temperature may cause serious errors unless compensating device is used.
(c) these instruments are costlier and consume more power in comparison to other instruments.
(d) both (b) and (c).

66. Decibel scale is useful while measuring voltages covering

(a) wide frequency ratio.
(b) wide voltage ratio.
(c) narrow frequency range.
(d) narrow voltage range.

67. Error due to hysteresis is predominant in

(a) moving coil instruments.
(b) moving iron instruments.
(c) hot-wire instruments.
(d) electrodynamometer instruments.

68. To measure currents in the MHz range, we use instrument of

(a) moving iron type.
(b) thermocouple type.
(c) electrodynamometer type.
(d) rectifier type.

69. Which one of the following types of instruments can be used to determine the rms values of ac voltage of high magnitude (10kV) and of any wave shape ?

(a) Moving iron
instruments.
(b) Dynamometer type instruments.
(c) Induction instruments.
(d) Electrostatic instruments.

 

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• Electrical and Electronics Measurement Mcq – 2
• Electrical and Electronics Measurement Mcq – 3
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• Electrical and Electronics Measurement Mcq – 5

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