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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 460 V.
 230 V.
 115 V.
 200 V.

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

 1 - s.
  2 - s.
 2 + s.
  s.

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  variable.
  constant.
  maximum.
  minimum.

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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 increases.
 remains same.
None of these
 decreases.

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Electrical Machines
In a dc machine, 1. physically, the brush axis is along the direct axis 2. physically, the brush axis is along the interpolar axis 3. schematically, the brush axis is along the direct axis 4. schematically, the brush axis is along the quadrature axis 5. armaturemmf is directed along the brush axis From these, the correct statements are

 2, 4, 5
 2, 3, 5
 1, 4,5
 1 , 3, 5

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Electrical Machines
The stator frame in an induction motor is used to

  ventilate the armature.
  hold armature stamping in position.
  protect the whole machine.
  provide return path for the flux.

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MORE MCQ ON Electrical Machines

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