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

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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.
 to perform linear operation like addition and multiplication.
 change the quantity under measurement to an analogues signal.
 to perform non liner operation like clipping filtering, chopping and clamping.

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