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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 linearised
 any of the above
 parabola
 hyperbola

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Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 MNA
 GNA
 either GNA or MNA
None of these

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

  magnetizing electric current and back emf.
None of these
  the rotating stator flux and rotor flux.
  the supply voltage and the back emf.

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

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

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Electrical Machines
In a DC compound motor the field regulator is provided to

 control the field flux.
 control the armature flux.
 limit the armature current.
 demagnetize the field partially.

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Electrical Machines
Which of the following relation is correct?

 Xd = Xq.
None of these
 Xd > Xq.
 Xd < Xq.

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MORE MCQ ON Electrical Machines

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