GETCO Exam Paper (30-11-2008)
If a power system is transiently stable, it

may be dynamically unstable
both (a) & (c )
will oscillate beyond the first swing
is always dynamically stable

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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

the output is sinusoidal and hence cannot be measured
losses are abnormally high
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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