单项选择题

The function of damper windings in a synchronous motor is to （）.

A.eliminate slippage
B.provide excitation
C.provide starting torque
D.increase efficiency

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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
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
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