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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

 Cast iron.
 Silicon steel.
 Mild steel.
  Fibre.

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

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

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  skewing.
  slip.
  crawling.
  cogging.

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  magnetic inertia.
  high speed.
  high field resistance.
  residual flux.

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Electrical Machines
An unexcited single phase synchronous motor is

  universal motor.
 reluctance motor.
 AC series motor.
 repulsion motor.

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Electrical Machines
The stator core of a 3 - Φ induction motor is laminated in order to reduce the

  hysteresis loss.
  weight of the stator.
  both of the above.
  eddy current loss.

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MORE MCQ ON Electrical Machines

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