题目内容

In the marine power system,the frequency adjustment and distribution of active power are realized by ( ) collectively.

A. governor of prime mover
B. automatic frequency adjustment and load control device
C. governor of prime mover and self-excitation voltage regulator
D. governor of prime mover, automatic frequency adjustment and load control device

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For two generators running online in parallel, if we only increase oil throttle of one generator, and keep another generator unchanged, then it will lead to ( ).

A. decrease of frequency
B. increase of frequency
C. vibration of frequency
D. decrease of voltage

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The reason for the failure of synchronizing operation, the reason cann’t be ( ) for the generator under normal running condition.

A. improper operation, random switching on under conditions that do not meet parallel operation conditions
B. failure to shift loads in time after the synchronizing operation is finished
C. The online generator is running under no-load
D. phase sequence is not the same

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There are many meters on the synchronizing panel, we should to pay attention to the ( ) carefully when performing the synchronizing operation.

A. field current meter
B. current meter
C. synchro-scope
D. power factor meter

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When synchroscope is used for synchronizing operation, the lamp will rotate ( ) a circle if the frequency difference is 0.25 Hz.

A. 1s
B. 2s
C. 3s
D. 4s

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In the marine power system,the frequency adjustment and distribution of active power are realized by ( ) collectively.

A. governor of prime mover B. automatic frequency adjustment and load control device C. governor of prime mover and self-excitation voltage regulator D. governor of prime mover, automatic frequency adjustment and load control device

For two generators running online in parallel, if we only increase oil throttle of one generator, and keep another generator unchanged, then it will lead to ( ).

The reason for the failure of synchronizing operation, the reason cann’t be ( ) for the generator under normal running condition.

There are many meters on the synchronizing panel, we should to pay attention to the ( ) carefully when performing the synchronizing operation.

When synchroscope is used for synchronizing operation, the lamp will rotate ( ) a circle if the frequency difference is 0.25 Hz.

A. governor of prime mover
B. automatic frequency adjustment and load control device
C. governor of prime mover and self-excitation voltage regulator
D. governor of prime mover, automatic frequency adjustment and load control device