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.
  - 597 W.
 - 795 W.
 + 597 W.

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Measurement and Instrumentation
Why is a MISC meter not recommended for DC measurement?

The error is high due to eddy current effect
The meter does not respond to DC signals
The meter is calibrated for AC and it’s error for DC would be high
The error is high due to hysteresis effect

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