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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?

0.73
1
0.84
0.65

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Measurement and Instrumentation
The main advantage of Anderson bridge over Maxwell bridge is that

 measures high Q inductors.
  reduction of the cost.
 attaining balance condition is easier.
 balance equation independent of frequency.

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Measurement and Instrumentation
A ______ device prevents the oscillation of the moving statem and enables the latter to reach its final position quickly

Controlling
Deflecting
None of the listed here
Damping

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Measurement and Instrumentation
A PMMC voltmeter is connected across a series combination of a DC voltage source V1 = 2 V and an AC voltage source V2 = 3sin4t, the voltmeters reads

 0 V.
 2 V.
 5 V.
 (2 + √3/2)V.

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Measurement and Instrumentation
Null type recorders are

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

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

Current transformers
All of the listed here
Potential transformers
Shunt

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