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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/S
 1/(1-S)
 S
 1-S

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Electrical Machines
Dummy coils are used for

 mechanical balancing.
 reducing armature reaction.
 increasing efficiency.
All of these

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Electrical Machines
Breather is provided in a transformer to

 filter the transformer oil.
 absorb moisture from air entering in transformer.
  absorb moisture of air during breathing.
 provide cold air in transformer.

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

 Increases cost.
 makes the material brittle.
All of these
 increases hysteresis loss.

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Electrical Machines
The type of DC generator used for arc welding purpose is a

 cumulatively compounded generator
 shunt generator
 differentially compounded generator
 series generator

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Electrical Machines
Which of the following statements are correct ?

 The leakage reactance of the induction motor should be small.
None of these
 A small value of leakage reactance will increase the maximum power output of motor.
 Both 1 and 2.

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