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Electrical Machines

Electrical Machines
In alternator, the rotary part is

  magnetic field poles.
 core.
 none of these.
 armature.

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 direct axis and interpolar axis
 quadrature axis and direct axis
 quadrature axis and interpolar axis
 direct axis and indirect axis

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

None of these
 3 %.
  3.33 %.
 0 .001 %.

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Electrical Machines
The ventilating ducts in most of DC machine are

 radial as well as longitudinal.
 longitudinal.
 radial.
 none of these.

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Electrical Machines
Regenerative braking is possible in

  DC shunt motor with field weakening control.
 DC shunt motor with armature resistance control.
 DC series motor.
 DC compound motor.

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

  8.
 4.
 1.
 2.

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