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Measurement and Instrumentation

Measurement and Instrumentation
In induction type ammeter, _____ damping is provided.

None of the listed here
Fluid friction
Eaddy current
Air friction

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Measurement and Instrumentation
A rectifier type instrument is connected to 100VDC and is operated in the DC measuring module reads

100V
90V
111V
50V

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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?

0.65
0.73
0.84
1

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Measurement and Instrumentation
In flux meter, the controlling torque is produced by

 not provided at all.
 spring.
 weight attached to the moving coil.
 crossed coil mechanism.

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Measurement and Instrumentation
Which instrument has identical calibration for ac as well as dc values?

Moving coil type
Induction type
Hot wire type
Moving iron type

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Measurement and Instrumentation
An electrodynamic meter can be used to measure

 DC current.
  both AC and DC voltage.
 DC voltage.
 AC volatge.

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