Measurement and Instrumentation
A resistance of 105 ohms is specified using significant figures as indicated below : 1. 105 ohms 2. 105.0 ohms 3. 0.000105 mega ohms Among these,

 1 represents greater precision than 2 and 3.
 1, 2 and 3 represent same precision.
 2 and 3 represent greater precision than 1.
 2 represents greater precision but 1 and 3 represent same precision.

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

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