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

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

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Measurement and Instrumentation
A resistance of 105 ohms is specified using significant figures as indicated below : 1. 105 ohms 2. 105.0 ohms 3. 0.000105 mega ohms Among these,

 2 represents greater precision but 1 and 3 represent same precision.
 2 and 3 represent greater precision than 1.
 1 represents greater precision than 2 and 3.
 1, 2 and 3 represent same precision.

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