Discussion
A generator whose load exceeds the power its prime mover is supplying will
Answer: D
Correct answer: slow down, and with it the system frequency
If the electrical load exceeds the mechanical power supplied, the deficit comes out of the rotating kinetic energy of the machine and it decelerates, carrying the frequency down with it. The governor senses the fall and admits more steam or water. On a system, a falling frequency is the signal that generation is short of demand.
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