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

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Measurement and Instrumentation
The measurement of a quantity

 none of these.
  is a comparison of an unknown quantity with standard.
 is a comparison of an unknown quantity with known quantity.
 is a comparison of an unknown quantity with another quantity.

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