Measurement and Instrumentation
The power factor of a single phase load can be calculated if the instruments available are

One voltmeter, one ammeter and one wattmeter
One voltmeter and one ammeter
One ammeter, one voltmeter and one energy meter
Any of the listed here

ANSWER DOWNLOAD EXAMIANS APP

Measurement and Instrumentation
The measurement of a quantity

  is a comparison of an unknown quantity with standard.
 is a comparison of an unknown quantity with another quantity.
 none of these.
 is a comparison of an unknown quantity with known quantity.

ANSWER DOWNLOAD EXAMIANS APP