单项选择题

When the current flow through a copper wire increases, its （）

A.resistance will decrease
B.insulation will bum
C.temperature will increase
D.conductivity will increase

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单项选择题

When securing an AC generator, you should FIRST （）.

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

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

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