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Electrical Machines

Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f²
 V²
 f
 V

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

  cogging.
  skewing.
  crawling.
  slip.

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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  High.
  Low.
  Equal to 1.
  Same as full load.

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Semi closed slots.
  Closed slots.
  Open slots.
  None of above.

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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

 direction of induced emf.
 direction of motion of the conductor.
 opposite to the direction of motion of the conductor.
 direction of flux.

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 1000 rpm, - 50 rpm.
 zero, 950 rpm.
 zero , - 50 rpm.
 1000 rpm, 950 rpm.

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MORE MCQ ON Electrical Machines

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