Measurement and Instrumentation
Resolution of an instrument is

 the maximum non linearity.
 the minimum quantity it can measure.
 ability to distinguish polarity.
 the maximum quantity it can measure.

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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
One of the wattmeters will read zero
Both give the same readings
Pressure coil of the wattmeter will become ineffective.

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