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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 eddy current loss
 hysteresis loss
 both 1and 2
 copper loss

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

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

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Electrical Machines
A DC generator without commutator is a

 DC motor
 DC generator
 induction motor
 AC generator

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

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

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 cumulative compound.
 series.
 shunt.
 differential compound.

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

  number of turns in coil.
  flux per pole.
All of these
  frequency of waveform.

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MORE MCQ ON Electrical Machines

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