單項(xiàng)選擇題The unit of electrical power is the ()

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


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1.單項(xiàng)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

3.單項(xiàng)選擇題Current flowing in only one direction is called ()

A.alternating current
B.omnidirectional current
C.direct current
D.sinusoidal current

4.單項(xiàng)選擇題Accidental grounds in a shipboard electrical system must be repaired as soon as possible as they will ()

A.result in immediate power outages
B.damage circuit breakers
C.appear on the ground detection system
D.damage insulation and may cause outages

5.單項(xiàng)選擇題Prior to closing the breaker when paralleling two AC generators, the recommended practice is to have the frequency of the incoming machine ()

A.slightly less than the line frequency
B.the same as the line frequency
C.slightly greater than the line frequency
D.All of the above