GETCO Exam Paper (30-11-2008)
The load carrying capability of a long transmission line

may be limited by stability considerations
is increased at low ambient air temperature
both (a) & (b)
is always limited by conductor area

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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

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

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