Measurement and Instrumentation
The current ‘I’ through a resistance R is measures with the following uncertainties I = 4 A ± 0.5%, R = 100Ω±0.2%. If power is computed from these two measured quantities, the uncertainty in the power computed will be

 1%
 1.5%
 1.2%
 0.5%

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP