Measurement and Instrumentation
A power factor meter has

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

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

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