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ELECTRICAL MACHINES

Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

 1920 Watt.
 1800 Watt.
  1960 Watt.
  980 Watt.

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Electrical Machines
Which of these types of motor is self starting?

  Poly-phase induction motor.
  Poly-phase synchronous machine.
  Single phase induction motor.
  None of these.

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Electrical Machines
A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?

  30 Hz.
 35 Hz.
 20 Hz.
  Can be determined.

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  It will rotates in reverse direction.
  It will rotates in normal operation.
  Either short circuit or open circuit occurs.
  Fail to start.

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Electrical Machines
Rotating magnetic field is produced in an induction motor because of

  rotor winding.
None of these
  either stator winding or rotor winding.
  stator winding.

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