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

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

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

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

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