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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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For manually quasi-synchronizing method ( the nonimal frequency is 50 Hz ), the allowable differences of voltage, frequency and primary phase angle is ( ).

A. △U≤±6%UN、△f≤±0.5Hz、△δ≤±30°
B. △U≤±10%UN、△f≤±0.5Hz、△δ≤±15°
C. △U≤±10%UN、△f≤±2Hz、△δ≤±30°
D. △U≤±10%UN、△f≤±2Hz、△δ≤±15°

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During parallel operation, unless the disassemble inspection is performed, otherwise we don’t have to check whether ( ) or not.

A. the voltage effective value is the same
B. frequency is the same
C. the phase angle is the same
D. the phase sequence is the same

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When two synchronous generators parallel running,there must have ( ).

A. equal voltage/equal current/ equal frequency
B. equal voltage/ equal frequency
C. equal current/ equal frequency
D. equal active power/ equal reactive power

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For essential loads onboard the ship, they are directly fed by main switchboard, so as to ( ).

A. Save money
B. easy operation
C. enhance the reliability of essential loads
D. improve the useage of essential loads

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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°

For manually quasi-synchronizing method ( the nonimal frequency is 50 Hz ), the allowable differences of voltage, frequency and primary phase angle is ( ).

During parallel operation, unless the disassemble inspection is performed, otherwise we don’t have to check whether ( ) or not.

When two synchronous generators parallel running,there must have ( ).

For essential loads onboard the ship, they are directly fed by main switchboard, so as to ( ).

A. 0°
B. 45°
C. 90°
D. 180°