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Electrical Machines

Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 16KVA
 20KVA
 0KVA
 4KVA

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Electrical Machines
Why are capacitors used with large AC induction motor?

  Improve power level.
  Improve power factor.
  Improve voltage level.
  Improve current level.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.2 lag
 0.2 lead
 0.9 lag
 unity

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 1.98
 0.04, 0.96
 0.02, 0.98
 0.04, 1.96

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Electrical Machines
A 4 pole DC generator runs at 750 rpm and generate an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb. What is the leakage co-efficient?

 1.8.
 1.5.
 1.4.
  1.2.

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

 compensating winding
 pole chamfering
 pole stacking
All of these

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