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

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Measurement and Instrumentation
In measurement system, the function of the signal manipulating elements is to

 to perform non liner operation like clipping filtering, chopping and clamping.
 change the magnitude of the input signal while retaining its identity.
 to perform linear operation like addition and multiplication.
 change the quantity under measurement to an analogues signal.

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