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

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

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

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

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