Measurement and Instrumentation
Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are

300V each
360V and 240V
400V and 200V
One of the meters out of the range and other 100V

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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.
 It is possible to standardize before a measurement is undertaken.
 The precision in measurment is independent of the type of the defector used.

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