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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

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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

單項(xiàng)選擇題

To equalize the power factor of two alternators operating in parallel, the （）

A.field excitation of both units is adjusted
B.governors of both units are adjusted
C.phase sequence is altered
D.kilowatt load is evenly divided

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