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Electrical Machines

Electrical Machines
The slip of an induction motor during DC rheostatic braking is

  s.
  2 - s.
 2 + s.
 1 - s.

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Electrical Machines
An unexcited single phase synchronous motor is

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

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Ra minimum and Rf minimum
 Ra maximum and Rf maximum
 Ra maximum and Rf minimum
 Rf maximum and Ra minimum

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 cosδ
 cos2δ
 sin2δ
 sinδ

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Electrical Machines
Breadth factor is defined as the ratio of

 both 1 and 2.
None of these
 emf with concentrated winding to emf with distributed winding.
 emf with distributed winding to emf with concentrated winding.

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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  continue running in the same direction as before.
  get damaged.
  not run.
  run in a direction opposite to previous one.

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