单项选择题

Current changing in direction and rising and falling in value is （）.

A.AC
B.DC
C.generator
D.fresh water generator

相关考题

The output voltage of a three-phase alternator is regul...

单项选择题The output voltage of a three-phase alternator is regulated by the （）.

A.AC voltage to the armature
B.AC voltage to the field
C.DC voltage to the armature
D.DC voltage to the field

To repair a small electrical motor that has been submer...

单项选择题To repair a small electrical motor that has been submerged in saltwater, you should （）.

A.wash it with fresh water and apply an external source of heat
B.renew the windings
C.send it ashore to an approved service facility
D.rinse all electrical parts with a carbon tetrachloride cleaning solvent and then blow dry the motor with compressed air

A fuse that blows often should be replaced only with a ...

单项选择题A fuse that blows often should be replaced only with a fuse of （）.

A.the recommended current and voltage rating
B.higher current and voltage rating
C.higher current and lower voltage rating
D.lower current and higher voltage rating

船舶电气与船舶安全

Current changing in direction and rising and falling in value is （）.