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Electrical Machines

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

 1450W
 1820W
 2000W
 1920W

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  air gap does not matter.
  as small as possible.
  as wide as possible.
  depends on the material of stator and the rotor.

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Electrical Machines
Which of the following relation is correct?

 Xd > Xq.
 Xd = Xq.
 Xd < Xq.
None of these

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the number of turns in field coil.
  increase the speed of shaft rotation.
 increase the source frequency.
 increase the number of turns in armature coil.

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Electrical Machines
Air core transformer as compared to iron core transformer, has

  more copper loss.
  no magnetic core loss.
 less magnetic core loss.
 more magnetic core loss.

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 2
 1
 3 or 4
 0

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