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Electrical Machines

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

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

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increases the design cost
 increase the maintenance and repair
 increase the iron loss
All of these

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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  lighter in weight.
  easy to cast owing to its low melting point and is easily available.
  of low resistivity.
  cheaper in cost.

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Electrical Machines
In case of IM the torque is

  inversely proportional to slip.
  directly proportional to slip2.
  directly proportional to slip.
  inversely proportional to √slip.

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Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

 increase
 either increase or decrease
None of these
 decrease

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Electrical Machines
In DC machines shape of net flux density is?

 peaky in nature
 sine wave
 saddle shape
 flat tapped or trapezoidal

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