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Measurement and Instrumentation

Measurement and Instrumentation
The problem of Electrostatic coupling in a transformer is acute at

Low frequencies
Power frequencies
High load on the transformer
High frequencies

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Measurement and Instrumentation
A wheatstone bridge cannot be used for precision measurements because errors are introduced into on account of

 Resistance of connecting leads.
 All of above.
 Thermoelectric emfs.
 Contact resistance.

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Measurement and Instrumentation
The controlling torque of an indicating instrument ______ as the deflection of the moving system increases.

Remains same
None of the listed here
Decreases
Increases

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Measurement and Instrumentation
A megger is usually

Moving iron type instrument
Moving coil type instrument
Hot-wire type instrument
Electro-static type instrument

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Measurement and Instrumentation
On a simple ohmmeter, the 0 Ω mark is _______ of the scale.

Far left
None of the listed here
In the middle
Far right

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Measurement and Instrumentation
The maximum percentage error in the sum of two voltage measurements when V1 = 100V ± 1% and V2 = 80V ± 5% is

 ± 2.8%
 ± 4%
 ± 6%
 ± 3%

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