Measurement and Instrumentation
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures

Power proportional to 3 phase power if the load is balanced
Reactive power of R phase
Active power of Y phase
Active power in R phase

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Measurement and Instrumentation
A DC potentiometer is the best means available for the measurement of DC voltage because

 The precision in measurment is independent of the type of the defector used.
  It is based on null balance technique.
 It is possible to standardize before a measurement is undertaken.
 None of above.

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Measurement and Instrumentation
Assertion (A): A hot wire ammeter has a cramped scale. Reason (R): The heat is proportional to square of current.

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

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