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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  0.54.
 0.3.
 0.7.
  1.

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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 less than 50%.
 same.
 between 50% and 90%.
 more.

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

 3 %.
  3.33 %.
None of these
 0 .001 %.

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 Line current.
 None of above.
 Field current.
 Armature current.

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Electrical Machines
Hopkinson test is conducted under which of the following condition?

 no load
 any of the above
 full load
 half load

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 rough commutator surface.
 imperfect contact.
 severe sparking.
 any of above.

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