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Electrical Machines

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?

 40W
 80W
 60W
 100W

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Electrical Machines
Skewing of cage rotors offers the following advantages

  all of below.
  uniform torque.
  locking tendency is reduced.
  less noise.

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Electrical Machines
In electric locomotives which of the following motor are used ?

 DC compound motor.
 DC Shunt motor.
 Synchronous motor.
 DC series motor.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

 40 - 400 ampere conductor / metre.
  5000 - 45000 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.
 30000 - 100000 ampere conductor / metre.

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Electrical Machines
DC generator will not build up voltage

 due to wrong direction of rotation.
 if field resistance is more than critical resistance.
 any one of above.
  if it has lost residual magnetism.

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Saddle shape.
 Triangular and directed towards main pole.
 Peaky in nature.
 Triangular and directed towards brush axis.

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