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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
In DC generators brushes are used for

 convert ac armature current in to dc
 collecting of current without any sparkings
 reduce eddy current loss
 collecting of voltage

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 60W
 100W
 40W
 80W

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Electrical Machines
The shaft of induction motor may be unbalanced due to

  poor lubrication.
  uneven air gap.
  overheating of winding.
  overload.

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Electrical Machines
Armature of DC machine is made of

 silicon steel.
 non-ferrous material.
 conducting material.
 insulating material.

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Periodic variation of load.
  Small and constant load.
  Over-excitation.
  Over-loading for long period.

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