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

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

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Measurement and Instrumentation
Consider the following statement - 1. The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the current coil. 2. The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the voltage coil circuit.

  1 is false but 2 is true.
 Both 1 and 2 are true.
 1 is true but 2 is false.
 Both 1 and 2 are false.

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Measurement and Instrumentation
A Manganin swap resistance is connected in series with a moving coil ammeter consisting of a milli ammeter and a suitable shunt in order to

 Minimize the effect of stray magnetic fields.
 Obtaine large deflecting torque.
  Minimize the effect of temperature variation.
 Reduce the size of the meter.

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