GETCO Exam Paper (30-11-2008)
Transient stability of a power system depends on

the strength of transmission network
fault-clearing time
the short circuit ratio of generating units
All of these

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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
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

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