A moving iron voltmeter reads 250 V when connected to 250 V dc. If connected to 250 V 50 Hz, the voltmeter reading is likely to be

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

210 V

250 V

248 V

252 V

Correct Answer : Option (C) : 248 V

Explanation : The inductance of coil will allow slightly less ac current. Hence reading slightly less.

Recently Updated in Measurements and Instrumentation Questions

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

compensate for error in voltmeter

compensate for change in temperature

compensate for resistance of strain gauge

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

all coils are in parallel

the coils are in series-parallel

all the coils are in series

None of the above

Correct Answer : all the coils are in series

A permanent magnet moving coil measures

dc value

peak value

true rms value

rms plus dc value

Correct Answer : dc value