GETCO Exam Paper (30-11-2008)
Power system A is operating in parallel with other systems and has a frequency bias of 50 MW/0.1 Hz. For a loss of generation in one of the interconnected systems resulting in a frequency drop of 0.02 Hz, system A should

provide 20 MW of support
provide 10 MW of support
provide 30 MW support
not be affected

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

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