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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 copper loss
 hysteresis loss
 both 1and 2
 eddy current loss

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

  stator phases of the motor.
  starting resistance in the starter.
None of these
  rotor at slip rings.

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Electrical Machines
In DC generator, full form of MNA is what?

 Magnetically no-load armature co-ordinate.
  Magnetic neutral axis.
 Magnetic neutral armature co-ordinate.
 Magnetic no-load axis.

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

 the use of compensating winding.
 reactance voltage produced due to communication.
  the use equalizer in lap winding.
 the use drum winding.

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 supply voltage and excitation
 supply voltage and load angle
 supply voltage, load angle and excitation
 excitation and load angle

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Electrical Machines
Crawling in an induction motor is due to

  insufficient starting torque.
  space harmonics produced by winding currents.
  slip ring rotor.
  time harmonics in supply.

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MORE MCQ ON Electrical Machines

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