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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

  0.573.
 0.649.
 0.443.
 0.512.

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Electrical Machines
Armature reaction in dc motor results

  open circuit.
  decrease in speed.
  short circuit.
  increase in speed.

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

 unshaded, shaded
 unshaded, unshaded
 shaded, unshaded
 shaded, shaded

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Electrical Machines
Sparkless commutation can be achieved by employing

 compensating winding.
  high resistance carbon brushes.
  inter poles.
  any one or more of the above methods.

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  results in sparking trouble.
  increases armature speed.
  reduces inter poles flux density.
  reduces generator emf.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 500 rpm
 1000 rpm
 250 rpm
 2000 rpm

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