Measurement and Instrumentation
In eddy current damping, disc or former is made of a material that is a

Non conductor but magnetic
Conductor but magnetic
Conductor but non magnetic
Non conductor and non magnetic

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

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

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