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Electrical Machines

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

  linear.
  cage.
  none of these.
  wound.

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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

 40 volts.
 30 volts.
 10 volts.
 20 volts.

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Electrical Machines
Which of the following motors has negative speed regulation?

 Shunt motors.
 Differential compound motors.
 Series motors.
 Both B and C.

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Electrical Machines
The functions of inter poles are

 reduce cross magnetization effect and improve commutation
None of these
 nullify reactance voltage and improve the commutation.
 both 1 and 2

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Electrical Machines
For power factor improvement the synchronous motor is to be

 lightly loaded and underecited
 lightly loaded and over excited
 heavily loaded and over excited
 heavily loaded and underexcited

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Electrical Machines
Which of the following motor used in hair dryers?

  Synchronous motors.
  Shaded pole IM.
  Split phase IM.
  Cage induction motor.

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