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Electrical Machines

Electrical Machines
DC machine windings are

 short pitched
None of these
 either of these
 full pitched

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Electrical Machines
No load saturation characteristics are plotted between

 short circuit current and field current
 short circuit current and armature current
 no load voltage and armature current
 no load voltage and field current

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Electrical Machines
Dummy coils are used for

 reducing armature reaction.
 increasing efficiency.
 mechanical balancing.
All of these

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Electrical Machines
A crusher is equipped with

 DC shunt motor.
 Synchronous motor.
 Slip ring induction motor.
 Reluctance motor.

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Electrical Machines
The speed of rotation of 5th harmonic component in the stator of an induction motor is

  (1 / 5) times the synchronous speed.
 5 times the synchronous speed.
  0.5 times the synchronous speed.
 (1 / 15) times the synchronous speed.

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.75 p.u
  0.125 p.u
  0.5 p.u
  0.25 p.u

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MORE MCQ ON Electrical Machines

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