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Electrical Machines

Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  cogging.
  skewing.
  slip.
  crawling.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 50, 1500.
 60, 1440.
 1440, 1500.
  60, 1500.

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 230 V
 200 V
 460 V
 115 V

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Electrical Machines
Which of the following motor used in hair dryers?

  Cage induction motor.
  Split phase IM.
  Shaded pole IM.
  Synchronous motors.

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

 1
 3 or 4
 0
 2

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 20 volts.
 40 volts.
 30 volts.
 10 volts.

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