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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

 3 to 5.
  1.5 to 2.
 2 to 3.
 1.0.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 any of the above.
 slip speed.
 normal speed.
 synchronous speed.

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Electrical Machines
Breadth factor is defined as the ratio of

None of these
 emf with concentrated winding to emf with distributed winding.
 emf with distributed winding to emf with concentrated winding.
 both 1 and 2.

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Electrical Machines
In a synchronous motor, damper windings are provided on

  rotor shaft.
  stator frame.
None of these
  pole faces.

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Reluctance motors.
  Stepper motors.
  Induction motors.
  Universal motors.

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

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

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