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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  get over heated.
  run normally.
  not run.
  make noise.

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 6 V
 somewhat less than 230 V
 230 V
 somewhat more than 230 V

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Electrical Machines
Induction motors have the advantage of

  less cost.
  all of below.
  simple in construction.
  less maintenance.

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  f / s.
  sf / 2.
  sf.
  s2.

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 has no relation.
 none of these.
 inversely.
 directly.

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to achieve a stronger magnetic field.
 to avoid over heating.
All of these
 to avoid locking of the armature.

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MORE MCQ ON Electrical Machines

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