Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

In an ac single phase energy meter, the potential coil is put on
A:
both side limbs, of upper magnet
B:
central limb of upper magnet
C:
one side limb of upper magnet
D:
either (a) or (b)
Answer: B
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In measurements using strain gauge, the dummy strain gauge is used to
A:
compensate for resistance of strain gauge
B:
compensate for change in temperature
C:
compensate for error due to change in voltage of battery
D:
compensate for error in voltmeter
Answer: B
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A CT is used to feed current coils of wattmeter, energy meter, power factor meter and an ammeter. Then
A:
all the coils are in series
B:
all coils are in parallel
C:
the coils are in series-parallel
D:
either (a) or (b)
Answer: A
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A permanent magnet moving coil measures
A:
true rms value
B:
dc value
C:
peak value
D:
rms plus dc value
Answer: B
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In low power factor wattmeter, the compensating coil is connected
A:
in series with current coil
B:
in parallel with current coil
C:
in series with pressure coil
D:
in parallel with pressure coil
Answer: C
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