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Measurement and Instrumentation

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

Wh
kWh
kW
VAR

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

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

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Measurement and Instrumentation
The current ‘I’ through a resistance R is measures with the following uncertainties I = 4 A ± 0.5%, R = 100Ω±0.2%. If power is computed from these two measured quantities, the uncertainty in the power computed will be

 1%
 1.2%
 0.5%
 1.5%

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Measurement and Instrumentation
Standardization of potentiometer is done in order that, they become

 precise.
 accurate and direct reading.
 accurate.
 accurate and precise.

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Measurement and Instrumentation
______ instruments are most sensitive.

Permanent magnet moving coil
Moving iron
Hot wire
Dynamometer

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Measurement and Instrumentation
Comparison methods are used

 because they are most simple.
 because they take least time in measurement.
 because they are expensive.
 when a high accuracy of measurement is required.

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