Measurement and Instrumentation
To measure ac as well as dc power, we use

None of the listed here
Sometimes induction and sometimes dynamometer wattmeter
Dynamometer wattmeter
Induction wattmeter

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

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