Measurement and Instrumentation
Potentiometer method of DC voltage measurement is more accurate than direct measurement using a voltmeter because

 It loads the circuit to maximum extent.
 It loads the circuit moderately.
 It uses centre zero galvanometer instead of voltmeter.
  It does not load the circuit at all.

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

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