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Electrical Machines

Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

  1.5 to 2.
 3 to 5.
 1.0.
 2 to 3.

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Electrical Machines
_____________ types of induction motor are widely used.

  Squirrel cage IM.
  Slip ring IM.
  Single phase IM.
  Three phase IM.

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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 decrease starting torque
 increase pull out torque
 improve starting torque
 reduce magnetising current and improve power factor

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Electrical Machines
What is the full form of MNP?

  Magnetic neutral pole.
  Magnetic field neutral plane.
  Magnetic neutral plane.
  Magnetic field neutral pole.

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

 to carry extra load.
 to interconnect three voltage systems.
  to suppress harmonic and unbalance in voltage.
None of these

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

 kept constant to certain value.
  remains unchanged.
 increased.
 decreased.

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