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Electrical Machines

Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 -1.92
 0.08
 1.92
 -0.08

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Semi closed slots.
  Open slots.
  None of above.
  Closed slots.

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Electrical Machines
Short circuiting is caused in the armature winding due to

  grounding of two or more turns of the same coil.
  failure of insulation between two turns of coil.
 failure of insulation between two commutator bars.
  any of above.

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Electrical Machines
In DC generator, lap winding is used in

 high voltage and low current applications.
 where greater load is connected.
 where constant speed is required.
  high current and low voltage applications.

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Electrical Machines
In double cage induction motor, the inner cage offers

  low resistance and high reactance.
  high resistance and low reactance.
  high resistance and high reactance.
  low resistance and low reactance.

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Armature circuit resistance control.
 Field resistance control.
 Any of above.
 Armature voltage control.

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