Measurement and Instrumentation
The disc of an instrument using eddy current damping should be of

None of the listed here
Conducting and non magnetic material
Non conducting and magnetic material
Conducting and magnetic material

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

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