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Measurement and Instrumentation

Measurement and Instrumentation
One single phase wattmeter operating on 230V and 5A for 5 hours makes 1940 revolutions. Meter constant in revolutions is 400. What is the power factor of the land?

1
0.84
0.65
0.73

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Measurement and Instrumentation
Induction type single phase energy meters measure electric energy in

kW
Wh
VAR
kWh

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Measurement and Instrumentation
A potentiometer may be used for

All of the listed here
Calibration of ammeter
Measurrment of resistance
Measurement of current

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Measurement and Instrumentation
Null type recorders are

 potentiometric recorders.
 LVDT recorders.
 any one of the above.
 bridge recorders.

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Measurement and Instrumentation
In a dynamometer wattmeter, the moving coil is the

Current coil and potential coil
None of the listed here
Current coil
Potential coil

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Measurement and Instrumentation
The chemical effect of current is used in

C. energy meter
C. ammeter hour meter
C. ammeter
None of these

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