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Electrical Machines

Electrical Machines
Stepper motor is used in

All of these
 traction
 food processing
 computer printers

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 all of above.
 high maintenance cost.
 poor overall efficiency.
 high initial cost.

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Electrical Machines
The frame of an induction motor is made of

  closed grained cast iron.
  stainless steel.
  silicon steel.
  aluminium.

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

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

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  0.54.
 0.3.
  1.
 0.7.

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Stator winding.
  Both rotor and stator winding.
  Rotor mmf wave.
  Rotor winding.

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MORE MCQ ON Electrical Machines

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