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Electrical Machines

Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 1
 100
 10
 50

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 BYR
All of these
 RBY
 BRY

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Electrical Machines
A generator may loose residual magnetism due to

  vibrations.
  heating.
  any of these.
  over excitation.

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Electrical Machines
Which of the following motor is used in grinders?

  Capacitor start capacitor run IM.
  Synchronous motor.
  Split phase IM.
  Capacitor start IM.

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 temperature rise
 mechanical loss
 eddy-current loss
 hysteresis loss

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Electrical Machines
In DC machine yoke offers

 both A and B
 produce working flux
 flux path completion
 mechanical protection to the machine

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