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


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1.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

2.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