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Electrical Machines

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

 lap winding
None of these
 both 1 and 2
 wave winding

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Electrical Machines
A smaller air gap in a induction motor helps to

 reduce the chance of crawling.
 reduce the chance of cogging.
 reduce the magnetizing current.
 increase the starting torque.

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Electrical Machines
If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will

 Reduce by 5%.
 Depends on other factor.
 Remain unchanged.
  Increase by 5%.

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Electrical Machines
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,

  12.
 7.
 4.
 3.

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Electrical Machines
A generator may loose residual magnetism due to

  heating.
  over excitation.
  vibrations.
  any of these.

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Electrical Machines
The three point starter is used for

  Series motor.
  Shunt motor.
  Shunt motor as well as compound motors.
  Shunt, compound and series motor.

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