Which of the following is not correct in respect of electrostatic instrument? - Measurements and Instrumentation

Electronics and Communication Engineering (ECE) : Measurements and Instrumentation - Quiz(MCQ)

Which of the following is not correct in respect of electrostatic instrument?

A)

It has a uniform scale

B)

It is essentially a voltmeter

C)

It can be used for both ac and dc

D)

It is suitable for only high voltages

Correct Answer : Option (A) : It has a uniform scale

Explanation : The scale of electrostatic voltmeter is not uniform.

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In measurements using strain gauge, the dummy strain gauge is used to

A)

compensate for error in voltmeter

B)

compensate for change in temperature

C)

compensate for resistance of strain gauge

D)

compensate for error due to change in voltage of battery

Correct Answer : compensate for change in temperature

A CT is used to feed current coils of wattmeter, energy meter, power factor meter and an ammeter. Then

A)

all coils are in parallel

B)

the coils are in series-parallel

C)

all the coils are in series

D)

None of the above

Correct Answer : all the coils are in series

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A)

dc value

B)

peak value

C)

true rms value

D)

rms plus dc value

Correct Answer : dc value

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