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Electrical Machines

Electrical Machines
The flux involved in the emf equation of a transformer has

  maximum value.
 total value.
 rms value.
 average value.

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Electrical Machines
In DC generators brushes are used for

 collecting of current without any sparkings
 convert ac armature current in to dc
 reduce eddy current loss
 collecting of voltage

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia.
  Ia2.
  1/Ia.
  √Ia.

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 reduced by 10%
 increased by 20%
 increased by 10%
 reduced by 20%

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  Stepper motor.
  Slip ring induction motor.
  DC differential compound motor.
  Synchronous motor.

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imax
 Vmax to Imin
 Vmin to Imin
 Vmax to Imax

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MORE MCQ ON Electrical Machines

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