题目内容

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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When synchronizing operation for synchronous generator, if other requirements all meet,only have phase difference, as phase difference is ( ) , there have the minimal surge current .

A. 0°
B. 45°
C. 90°
D. 180°

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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

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 ( ).

When synchronizing operation for synchronous generator, if other requirements all meet,only have phase difference, as phase difference is ( ) , there have the minimal surge current .

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