Measurement and Instrumentation
The disc of an instrument using eddy current damping should be of

Conducting and non magnetic material
None of the listed here
Non conducting and magnetic material
Conducting and magnetic material

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

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

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