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單項(xiàng)選擇題

The DC excitation to the field of brushless synchronous is generally produced by （）

A.an exciter driven by the same shaft with the generator
B.an exciter driven by external prime mover
C.generator itself
D.either A and B

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單項(xiàng)選擇題

Which of the following equipment is not pollution prevention equipment?（）

A.oily water separator
B.sewage treatment plant
C.fuel oil separator
D.incinerator

單項(xiàng)選擇題

The initial voltage of self-excitation generator set up by（）

A.residual magnetism
B.voltage regulator
C.electrical current for excitation
D.the other running generator

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