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Measurement and Instrumentation

Measurement and Instrumentation
The errors mainly caused by human mistakes are

  gross error.
 instrumental error.
 systematic error.
 observational error.

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Measurement and Instrumentation
The internal resistance of Weston standard cell is of order of

 10 ohm.
 100 ohm.
 1 ohm.
 1000 ohm.

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Measurement and Instrumentation
Relative permittivity can be measured by _______ bridge

 Desautys.
 Schering.
 Wheatstones.
 Hays.

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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

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

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Measurement and Instrumentation
A set of independent current measurements taken by four observers was recorded as : 117.02 mA, 117.11 mA, 117.08 mA and 117.03 mA. What is the range of error ?

 ± 0.056
 ± 0.065
 ± 0.045
 ± 0.054

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Measurement and Instrumentation
In two wattmeter method of power measurement if the total power is measured by one wattmeter only then power factor of the system is

 none of above.
 0.5.
 1.
 0.

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