Measurement and Instrumentation
A power factor meter has

Two current circuit and one pressure circuit
None of the listed here
One current circuit and one pressure circuit
One current circuit and two pressure circuits

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

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