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Electrical Machines

Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 32.
 8.
 16.
  4.

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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
For power factor improvement the synchronous motor is to be

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

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

  None of these.
  120 volt.
 220.4 volt.
  218.5 volt.

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Electrical Machines
At slip s = 1 torque developed in machine is

  maximum torque.
  electromagnetic torque.
  none.
  starting torque.

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 6 V
 somewhat more than 230 V
 230 V
 somewhat less than 230 V

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