Phasor Diagram of a Cylindrical Rotor Alternator MCQ

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• Potier method is very accurate due to __________
  ক

  emfs are handled as voltage and mmf as AT

  খ

  emf and mmf are handled as AT

  গ

  emf and mmf are handled as voltage

  ঘ

  none of the mentioned
• The leakage reactance can be determined with lesser accuracy by using Potier triangle.
  ক

  True

  খ

  False
• From the OCC and SCC curves, what does the intercept BC represent?
  ক

  Armature reaction

  খ

  Leakage reactance

  গ

  Armature copper losses

  ঘ

  Sum of armature reaction and leakage reactance
• From the OCC and SCC curves, what does the intercept AB represent?
  ক

  Armature reaction

  খ

  Leakage reactance

  গ

  Armature copper losses

  ঘ

  Sum of armature reaction and leakage reactance
• The short circuit characteristic of alternator is a straight line due to __________
  ক

  no saturation

  খ

  no armature reaction

  গ

  no eddy current

  ঘ

  all of the mentioned
• Phasor diagram below is best describing the __________
  ক

  Open circuit characteristic of alternator

  খ

  Short circuit characteristic of alternator

  গ

  External circuit characteristic of alternator

  ঘ

  Internal circuit characteristic of alternator
• The load angle δ is between __________
  ক

  Ef and Ia

  খ

  Ia and field flux

  গ

  Ef and Vt

  ঘ

  Vt and Ia
• The internal power factor angle Ψ is between __________
  ক

  Ef and Ia

  খ

  Ia and field flux

  গ

  Ef and Vt

  ঘ

  Vt and Ia
• If the resultant flux will not be in phase with the resultant mmf Fr. This is due to __________
  ক

  hysteresis effect

  খ

  armature reaction

  গ

  hysteresis effect and armature reaction

  ঘ

  eddy currents