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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  get over heated.
  run normally.
  make noise.
  not run.

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Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 45°
 60°
 10°
 30°

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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 improve starting torque
 increase pull out torque
 decrease starting torque
 reduce magnetising current and improve power factor

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Armature resistance control.
 Armature voltage control.
 Field diverter control.
 Field control.

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Electrical Machines
To achieve spark less commutation brushes of DC generator are rocked ahead so as to bring them

 just ahead of magnetic neutral axis.
None of these
 in magnetic neutral axis.
 just behind the magnetic neutral axis.

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 16/9.
 4/3.
 9/16.
 3/4.

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MORE MCQ ON Electrical Machines

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