Measurement and Instrumentation
Comparison methods are used

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

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Measurement and Instrumentation
A DC potentiometer is the best means available for the measurement of DC voltage because

 None of above.
  It is based on null balance technique.
 The precision in measurment is independent of the type of the defector used.
 It is possible to standardize before a measurement is undertaken.

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