Measurement and Instrumentation
The moving coil-meters, damping is provided by

 damping vane in the airtight chamber.
 the coil spring attached to the moving.
 the aluminium frame of the coil.
 eddy current disk.

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Measurement and Instrumentation
Assertion(A): A low power factor wattmeter has special constructional features to ensure accurate measurment. Reason(R): Extension of wattmeter range in DC circuit can be easily done by using current and potential transformer

 Both A and R is true and R is not correct explanation of A.
 A is true R is false.
 Both A and R is true and R is correct explanation of A C.
 A is false R is true.

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