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Electrical Machines

Electrical Machines
Armature resistance control method is used for the _______ ?

None of these
 below rated speed
 above rated speed
 both 1 and 2

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Electrical Machines
Compensating winding is placed in the

All of these
 armature core
 main field
 pole shoe

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Electrical Machines
A compound motor has

  only series field winding.
  tertiary winding.
  only shunt field winding.
  both shunt and series field winding.

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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

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

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Electrical Machines
In escalator which motor is used?

  DC shunt motor.
  Universal motor.
  3 - φ IM.
  1 - φ IM.

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Electrical Machines
The material used for commutator brushes is mostly

  carbon.
 cast iron.
 copper.
 mica.

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