DC Motors MCQ Questions and Answers Quiz

121. Which one of the following is not the function of pole shoes in a D.C. machine ?

  1. To reduce eddy current loss
  2. To support the field coils
  3. To spread out flux for better unifor-mity
  4. To reduce the reluctance of the mag-netic path

122. Why are the D.C. motors preferred for traction applications ?

  1. Torque and speed are inversely proportional to armature current
  2. Torque is proportional to armature current
  3. Torque is proportional to square root of armature current
  4. The speed is inversely proportional to the torque and the torque is proportional to square of armature current
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