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單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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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