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

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

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Measurement and Instrumentation
It can be stated that

CT operates with a higher flux density than PT
CT operates with considerably lower flux density than a PT
No generalisation can be made with regard to the flux densities in CT and PT
CT operates at almost the same flux density as a PT

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