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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(轮机专业) > 轮机英语 > 船舶电气与船舶安全

单项选择题

The primary function of an electric motor is to （）

A.develop torque
B.generate high voltages
C.produce a magnetic field
D.generate high electrical resistance

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单项选择题

The power factor at which a paralleled AC generator operates is usually adjusted by the （）.

A.connected load
B.prime mover speed
C.field excitation
D.generators rated voltage

单项选择题

If the resistance of a circuit is cut in half and the applied voltage is kept constant, the current flow will be （）.

A.doubled
B.quadrupled
C.unchanged
D.cut in half

单项选择题

Equal power factors on paralleled AC generators are maintained by an automatic （）.

A.voltage regulator
B.reverse power relay
C.reverse current relay
D.governor control switch

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