GETCO Exam Paper (30-11-2008)
The symmetrical components are used in fault analysis because

the result are in terms of symmetrical components
the number of equations become lesser
none of these
the sequence networks do not have mutual couplings

ANSWER DOWNLOAD EXAMIANS APP

GETCO Exam Paper (30-11-2008)
In a transformer it is difficult to measure the efficiency by output-input measurement methods because

output is out of phase with respect to input
efficiency of transformer is usually high and hence extremely accurate measurements will be necessary
the output is sinusoidal and hence cannot be measured
losses are abnormally high

ANSWER DOWNLOAD EXAMIANS APP