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Measurement and Instrumentation

Measurement and Instrumentation
A voltmeter using thermocouple measures

  rms value.
 Peak to peak value.
 Peak value.
 Average value.

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Measurement and Instrumentation
For measuring an AC voltage by an AC potentiometer it is desirable that the supply for the potentiometer is taken from

 A battery.
 A source other than the source of unknown voltage.
 The same source as the unknown voltage.
 Any of above.

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Measurement and Instrumentation
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures

Reactive power of R phase
Active power of Y phase
Power proportional to 3 phase power if the load is balanced
Active power in R phase

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Measurement and Instrumentation
Which of the following devices may be used for extending the range of instruments?

All of the listed here
Shunt
Current transformers
Potential transformers

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Measurement and Instrumentation
The pressure coil of a wattmeter should be connected on the supply side of the current coil when

Load impedance is low
Load impedance is high
None of these
Supply voltage is low

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Measurement and Instrumentation
Which wave has the least form factor?

Rectangular wave
Square wave
Triangular wave
Sine wave

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