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Electrical Machines

Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  none of these.
  cage.
  linear.
  wound.

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Electrical Machines
In 3 - Φ induction motor some times copper bars are placed deep in the rotor to

  improve starting torque.
  improve efficiency.
  improve power factor.
  reduce copper loss.

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of supply voltage.
  Change of supply frequency.
  Change of number of pole.
  Change of rotor resistance.

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 less and maximum torque increases
 more and maximum torque decreases
 less and maximum torque decreases
 more and maximum torque remains constant

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 8
 4
 2
 1

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  shaded pole type.
  capacitor run.
  split phase.
  capacitor start.

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