Measurement and Instrumentation
To measure ac as well as dc power, we use

Induction wattmeter
Dynamometer wattmeter
None of the listed here
Sometimes induction and sometimes dynamometer wattmeter

ANSWER DOWNLOAD EXAMIANS APP

Measurement and Instrumentation
A resistance is measured by the voltmeter-ammeter method employing dc excitation and a voltmeter of very high resistance connected directly across the unknown resistance. If the voltmeter and ammeter reading are subject to maximum possible errors of ± 2.4 % and ± 1.0 % respectively, then the magnitude of the maximum possible percentage error in the value of resistance deduced from the measurement is nearly

 ± 2.4%
 ± 3.4%
 ± 1%
 ± 1.4%

ANSWER DOWNLOAD EXAMIANS APP