Measurement and Instrumentation
An instrument to be used for measurement and control should preferably have

Dead zone and dead time
Linear output and fast response
Non-linear output
A highly damped response

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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

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

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