Measurement and Instrumentation
A single phase load is connected between R and Y terminals of a 415 V, symmetrical, 3-phase, 4 wire system with phase sequence RYB. A wattmeter is connected in the system as shown in figure. The power factor of the load is 0.8 lagging. The wattmeter will read

 - 795 W.
 + 795 W.
 + 597 W.
  - 597 W.

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

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

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