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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 -2 < S < 2
 0 < S < 1
 -1 < S < 1
 0 < S < 2

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  prevent hunting and provide the starting torque.
  reduce noise level only.
  provide starting torque only.
  reduce the eddy currents.

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 both decrese
 Ia increases and ωm decreses
 Ia remains constant but ωm increase
 both armature current Ia and speed ωm increase

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

 On armature.
  On yoke in the pole faces.
 On yoke in the inter pole gap.
None of these

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Electrical Machines
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator?

 Dummy coils.
 Equalizer rings.
 Eye bolt.
 Commutator.

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 speed.
 power.
 torque.
 current.

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