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單項選擇題

The unit "hertz" is equivalent to （）

A.coulombs per second
B.revolutions per second
C.revolutions per minute
D.cycles per second

單項選擇題

When paralleling two AC generators, the frequency of the machine coming on-line, immediately prior to closing its breaker, should be （）

A.slightly less than the oncoming generator frequency
B.the same as the bus frequency
C.slightly greater than the bus frequency
D.the same as the bus voltage

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A DC generator is used to supply direct current in order to maintain an AC generator field and is known as a/an （）

你可能感興趣的試題

The unit "hertz" is equivalent to （）

When paralleling two AC generators, the frequency of the machine coming on-line, immediately prior to closing its breaker, should be （）