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Electrical Machines

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

 parabola
 hyperbola
 any of the above
 linearised

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Electrical Machines
For which of the following loads, armature reaction is magnetizing in nature?

None of these
 pure capacitive load
 pure resistive load
 pure inductive load

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Electrical Machines
An electric motor with constant output power will have a torque speed characteristics in the form of a

 Rectangular hyperbola
 Straight line parallel to the speed axis.
 Circle about the origin.
 Straight line through the origin.

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Electrical Machines
Capacitor start capacitor run provides

  high staring torque only.
  high staring torque and high power factor.
  none.
  high power factor only.

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Electrical Machines
A generator may loose residual magnetism due to

  any of these.
  vibrations.
  over excitation.
  heating.

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

 3 point starter
 2 point starter
 4 point starter
All of these

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MORE MCQ ON Electrical Machines

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