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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相关考题
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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
