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Electrical Machines

Electrical Machines
Motors for fans and pumps are selected in the rpm range

  375 to 500.
  720 to 920.
  500 to 720.
  1440 to 2880.

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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  get damaged.
  run in a direction opposite to previous one.
  not run.
  continue running in the same direction as before.

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 10V
 200V
 100V
 20V

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Electrical Machines
The slot edges in a DC machine are made of

 Silicon steel.
 Mild steel.
  Fibre.
 Cast iron.

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Electrical Machines
Which of the following are variable losses?

 eddy current loss
 hysteresis loss
 shunt field copper loss
 armature copper loss

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 remain unchanged.
 approach zero.
 aprroach infinity.
 between zero and infinity.

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