单项选择题
Which of the following statements is true concerning all three-phase alternators?（）
A.Each has three separate but identical armature windings acted on by one system of rotating magnets
B.Each has one armature winding acted on by three identical but separate systems of rotating magnets
C.All three-phase alternators are designed to operate with a O8 leading power factor
D.The three phases always provide power to the load through three sets of slip rings and brushes
相关考题
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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 -
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
