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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

 16.
 8.
  4.
 32.

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Electrical Machines
In DC machine, the armature windings are placed on the rotor because of necessity for

 development of torque.
 electromechanical energy conversion.
 generation of voltage.
 commutation.

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 development of torque
 generation of voltage
 commutation
 electromechanical energy conversion

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

  dynamically induced voltage.
None of these
  statically induced voltage.
  reactance voltage.

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 2-S
 1/S
 S
 1-S

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

  zero.
  250 V.
 about 100 V.
  very small, say about 2 or 3 V.

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