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單項選擇題

The unit of electrical power is the （）

A.ampere
B.kilovolt
C.watt
D.farad

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單項選擇題

In an alternating current electrical system, a low system power factor is a direct sign of （）

A.wasted energy
B.efficient operation
C.a short in the exciter field windings
D.an excessive number of minor system grounds

單項選擇題

An alternator is being paralleled with one on the lineAt the INSTANT the circuit breaker is closed, the frequency of the incoming alternator will normally （）.

A.increase
B.not change
C.decrease
D.be exactly 60 hertz