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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
0.65
0.73
0.84

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Measurement and Instrumentation
Wagner earthing device is used to eliminate errors due to

Electrostatic coupling
Electromagnetic coupling
None of these
Both A and B

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Measurement and Instrumentation
A spring controlled indicating instrument has a deflection of 90deg for maximum current I. The corresponding deflection for a gravity controlled instrument is

30°
0°
120°
90°

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Measurement and Instrumentation
The multiplier and the meter coil in a voltmeter are in

None of the listed here
Series
Series-parallel
Parallel

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Measurement and Instrumentation
A pressure measurement instrument is calibrated between 10 bar and 260 bar. The scale span of the instrument is

  250 bar.
 260 bar.
 10 bar.
 270 bar.

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Measurement and Instrumentation
A moving iron ammeter may be compensated for frequency errors by

Shunt capacitance
A shunt resistance
Series resistance
A series inductance

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