单项选择题
A.open the generator circuit breaker B.switch the voltage regulator to “manual” C.decrease the field excitation to minimum D.reduce the load on the unit
Prior to starting an AC generator prime mover, the volt...
单项选择题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
The main purpose of an electric space heater installed ...
单项选择题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
A transformer in an electric circuit serves to （）A.gene...
单项选择题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
