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Electrical Machines

Electrical Machines
Equalizer rings are used in which of the followings?

None of these
 wave winding
 both 1 and 2
 lap winding

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Electrical Machines
In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is

  asynchronous generator.
  asynchronous motor.
  synchronous generator.
  synchronous motor.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing all the three leads from the supply.
  transposing any two leads from slip rings.
  disconnecting any one phase.
  transposing any two leads from supply.

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Repulsion.
  Capacitor run.
  Universal.
  Split phase.

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

None of these
 supply frequency
 supply voltage
 rotor resistance

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Electrical Machines
Breather is provided in a transformer to

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

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