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Electrical Machines

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

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

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Electrical Machines
The shaft of induction motor should be

  flexible.
  stiff.
  any of these.
  hollow.

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  prevent hunting and provide the starting torque.
  reduce the eddy currents.
  reduce noise level only.
  provide starting torque only.

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Electrical Machines
The material used for commutator brushes is mostly

 cast iron.
  carbon.
 mica.
 copper.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 44 A.
  40 A.
 400 A.
 440 A.

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Electrical Machines
A shaded pole single phase induction motor can be used for

 personal computers as cooling fan
 tape recorders
 food mixers
 wet grinders

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MORE MCQ ON Electrical Machines

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