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

 high.
 small.
 very high.
 ideally zero.

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

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

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