题目内容

For a 6-pole, 50 Hz marine diesel engine-generator sets, it nominal rotating speed is ( ).

A. 1000r/min
B. 960r/min
C. 500r/min
D. 480r/min

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For low speed diesel engine-generator sets , the rotor is usually adopts ( ), due to its ( ) centrifugal force at high speed.

A. non-salient pole rotor/ large
B. non-salient pole rotor/ small
C. salient pole rotor/ large
D. salient pole rotor/ small

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For a 3-phase induction motor working under nominal load condition, if the voltage of power source drops, the motor will ( ).

A. overload
B. underload
C. full load
D. remain the same

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For a 6-pole 3-phase induction motor, its nominal slip SN＝0.04, the its nominal rotating speed is ( ).

A. 200r/min
B. 380r/min
C. 540r/min
D. 960r/min

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The relationship between rotor current and slip of a squirrel cage induction motor is( ).

A. the bigger the s, the bigger the current
B. the bigger the s, the smaller the current
C. the current remains the same when s increases
D. none of the above

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For a 6-pole, 50 Hz marine diesel engine-generator sets, it nominal rotating speed is ( ).

A. 1000r/min B. 960r/min C. 500r/min D. 480r/min

For low speed diesel engine-generator sets , the rotor is usually adopts ( ), due to its ( ) centrifugal force at high speed.

For a 3-phase induction motor working under nominal load condition, if the voltage of power source drops, the motor will ( ).

For a 6-pole 3-phase induction motor, its nominal slip SN＝0.04, the its nominal rotating speed is ( ).

The relationship between rotor current and slip of a squirrel cage induction motor is( ).

A. 1000r/min
B. 960r/min
C. 500r/min
D. 480r/min