Measurement and Instrumentation
A moving iron ammeter produces a full scale torque of 240 μNm with a deflection of 120° at a current of 10 A. The rate of change of self induction (μH/radian) of the instrument at full scale is

 2.0 μH/radian.
 114.6 μH/radian.
 12.0 μH/radian.
 4.8 μH/radian.

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Measurement and Instrumentation
Assertion (A) : It is always desirable to take the reading of an indicating instrument very close to the full scale reading. Reason (R) : Accuracy of an indicating instrument is maximum at the full scale deflection and error increases as reading comes closer to the beginning of the scale.

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

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