GETCO Exam Paper (30-11-2008)
Dynamic stability characteristics are predominant in the period

both (b) & (c )
while governor is in action
between the time the governors start reacting and when the steady-state stability is reached
immediately following a loss of load

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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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