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Measurement and Instrumentation

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

None of these
Both A and B
Electrostatic coupling
Electromagnetic coupling

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Measurement and Instrumentation
The EMF of Weston standard cell is measured using

Potentiometer
Digital Volt meter
Moving-coil meter
Moving- iron meter

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Measurement and Instrumentation
The resistance in the circuit of the moving coil of a dynamometer wattmeter should be

High
Low
None of the listed here
Almost zero

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Measurement and Instrumentation
The chemical effect of current is used in

C. energy meter
C. ammeter hour meter
None of these
C. ammeter

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Measurement and Instrumentation
A megger is usually

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

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Measurement and Instrumentation
In a single phase energy meter, braking torque is provided by

None of the listed here
Permanent magnet
Air friction
Fluid friction

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