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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
The shaft of induction motor should be

  hollow.
  any of these.
  flexible.
  stiff.

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 16.
 8.
  4.
 32.

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Electrical Machines
What is the necessity of copper brushes in a dc motors?

  To absorb the mechanical shocks produced during running condition.
  None of these.
  To increase the flux cutting by the rotor.
  To convert alternating supply current to direct current.

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Electrical Machines
The DC compound motors are generally

 Cummulative compound.
 Differentical compound.
 Level Compound.
 None of these.

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

 Insulation requirement is less.
 Collecting of large current is simple.
 Operating cost is less.
All of these

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