To measure an unknown ac voltage by an ac potentiometer it is desirable that supply for the potentiometer is taken

A)
from a battery
B)
from a source which is not the same as unknown voltage
C)
from the same source as the unknown voltage
D)
Either (A) or (B)

Correct Answer : Option (C) :   from the same source as the unknown voltage

Recently Updated in Measurements and Instrumentation Questions
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

A permanent magnet moving coil measures
A)
dc value
B)
peak value
C)
true rms value
D)
rms plus dc value

Correct Answer :   dc value

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