Measurement and Instrumentation
Assertion (A) : Precision is a necessary prerequisiteof accuracy. Reason (R) : Precision guarantees accuracy.

 Both A and R are true and R is the correct explanation of A
 A is false bur R is true
 Both A and R are true but R is NOT the correct explanation of A
 A is true but R is false

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Measurement and Instrumentation
Which of following statement are correct in case of power factor meter?

 The restoring torque is provided by a controlling torque.
 It consist of two coils mounted at right angles to each other.
 The deflection is proportional to phase angle between field coil and crossed coil.
 Both B and C.

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