單項(xiàng)選擇題

Prior to starting an AC generator prime mover, the voltage regulator cutout switch should be placed in the （）

A.manual position
B.bus neutral position
C.raise voltage position
D.transfer position

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The main purpose of an electric space heater installed in a large AC generator is to （）

A.prevent the windings from becoming brittle
B.prevent moisture from condensing in the windings during shutdown
C.prevent acidic pitting of the slip rings
D.keep the lube oil warm for quick starting

單項(xiàng)選擇題

A transformer in an electric circuit serves to （）

A.generate its own electrical power
B.transform electrical energy into mechanical energy
C.increase or decrease circuit voltage as required
D.convert AC current to DC current

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