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

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GETCO Exam Paper (30-11-2008)
The function of a breather in a transformer is

to provide protection against over currents
to arrest flow of moisture into the tank
to suppress harmonics
to control the level of oil in the tank

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