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

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

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Measurement and Instrumentation
If an inductance L is connected in one arm of bridge and resistance R1, R2, R3 in other three arms

 The bridge can not be balanced.
 The bridge can be balanced.
 The bridge is balanced for some specified value of R1, R2, R3.
 The bridge is balanced for some specified value of frequency.

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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

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

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