Measurement and Instrumentation
A power factor meter has

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

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Measurement and Instrumentation
In AC circuits, the connection of measuring instruments cause loading effect errors which may effect

 only phase of the quantity being measured.
 only the magnitude of the quantity being measured.
 magnitude, phase and waveform of the quantity being measured.
 both of above.

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