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Electrical Machines

Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 2
 4
 1
 6

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Electrical Machines
Which of the following represents the pitch factor?

 Cos (α/2)
 sin (α/2)
 Cos α
 Cos α²

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  minimum.
  maximum.
  variable.
  constant.

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Electrical Machines
The effect of ------------------ on main field flux is armature reaction?

 armature flux
All of these
 armature mmf
 armature current

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Armature voltage.
  Armature current.
  Field excitaion.
  Supply voltage.

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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  transformer with secondary short circuited.
  synchronous motor.
  capacitor start induction motor.
  repulsion start induction motor.

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