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Electrical Machines

Electrical Machines
Motors for fans and pumps are selected in the rpm range

  375 to 500.
  720 to 920.
  500 to 720.
  1440 to 2880.

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Electrical Machines
The stator core of a 3 - Φ induction motor is laminated in order to reduce the

  eddy current loss.
  hysteresis loss.
  weight of the stator.
  both of the above.

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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 , 3, 5
 1, 4,5

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Electrical Machines
The shaft of induction motor should be

  any of these.
  flexible.
  hollow.
  stiff.

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

 constant V, Tst increases
 constant supply voltage V, starting torque Tst decreases
 either of these
None of these

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 1
 6
 4
 2

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