Measurement and Instrumentation
Which of following is not correct?

  An electronic voltmeter draw appreciable current from the source.
 An ammeter should have a very low resitance.
 A shunt should have a very low resistance.
 Voltmeter should have very high resistance.

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

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

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