Measurement and Instrumentation
Comparison methods are used

 because they take least time in measurement.
 when a high accuracy of measurement is required.
 because they are most simple.
 because they are expensive.

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

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

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