Measurement and Instrumentation
When a potentiometer is used for measurement of voltage of an unknown source, the power consumed in the circuit of the unknown source under null condition is

 ideally zero.
 very high.
 small.
 high.

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Measurement and Instrumentation
Which of following statement are correct in case of power factor meter?

 It consist of two coils mounted at right angles to each other.
 The restoring torque is provided by a controlling torque.
 Both B and C.
 The deflection is proportional to phase angle between field coil and crossed coil.

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