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

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

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Measurement and Instrumentation
For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging

One of the wattmeter connections will have to be reversed
Pressure coil of the wattmeter will become ineffective.
Both give the same readings
One of the wattmeters will read zero

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