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

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

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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
output is out of phase with respect to input
the output is sinusoidal and hence cannot be measured
losses are abnormally high

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GETCO Exam Paper (30-11-2008)
A buchholz will operate in a transformer whenever there is

over load
any of the above
large internal fault
saturation of magnetic circuit

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