A digital voltmeter has a read out range from 0 to 999 counts. If the full scale reading is 9.999 V, the resolution is

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

0.01 V

1 V

1 mV

1 Î¼V

Correct Answer : Option (C) : 1 mV

Explanation : Resolution is the smallest change in the quantity being measured which will cause an observable change in output. In this case it is 1 mV.

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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

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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

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Correct Answer : dc value

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