單項選擇題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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1.單項選擇題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

2.單項選擇題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

3.單項選擇題A constant output voltage from an AC generator is maintained by the ().

A.prime mover governor
B.exciter generator
C.voltage regulator
D.reverse power relay

4.單項選擇題What type of rotor is used in split-phase motors?()

A.Dram
B.Salient pole
C.Squirrel-cage
D.Wound-rotor

5.單項選擇題The load sharing characteristics of two diesel generator operating in parallel are mostly dependent on their governor ().

A.load limit settings
B.idle speed settings
C.speed limit settings
D.speed droop settings