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
Assertion (A): A hot wire ammeter has a cramped scale. Reason (R): The heat is proportional to square of current.

 Both A and R are true and R is correct explanation of A.
 Both A and R are true and R is not correct explanation of A.
 A is ture and R is false.
 A is false and R is ture.

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