题目内容

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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After synchronizing operation, the mainly reason why we cut off the syncro-scope is ( ).

A. power saving
B. synchroscope is for short-time duty
C. out of function for synchroscope
D. cannot shift active power if not cut off synchroscope

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After the generator was overhauled, when the parallel operation was performed for the first time, it was found that the synchronizing lamps are not bright and dark at the same time, which indicated ( ).

A. Standby generator’s rotating speed is too high
B. Standby generator’s rotating speed is too low
C. phase sequence is not the same
D. leading phase of standby generator

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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

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.

After synchronizing operation, the mainly reason why we cut off the syncro-scope is ( ).

After the generator was overhauled, when the parallel operation was performed for the first time, it was found that the synchronizing lamps are not bright and dark at the same time, which indicated ( ).

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