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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 linearised
 parabola
 any of the above
 hyperbola

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to get more flux.
 In order to get saturated.
 In order to not to get saturated.
All of these

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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
 unity
 0.9 lag

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Electrical Machines
Which of the following bearings and their uses are correct

 roller bearings → large machines
 both A and B
 ball bearings → small machines
 neither 1 nor 2

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Electrical Machines
A 3 - Φ slip ring motor has

  double cage rotor.
  short-circuited rotor.
  wound rotor.
  any of the above.

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Electrical Machines
Dummy coils are used for

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

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