Measurement and Instrumentation
The meter constant of a single phase 240 V induction watthour meter is 400 revolutions per KWh. The speed of the meter disc for a current of 10 Amperes of 0.8 p.f lagging will be

 21.1 rpm.
  12.8 rpm.
 18.2 rpm.
 16.02 rpm.

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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.

 A is false and R is ture.
 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.

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