Armature Reaction MCQ

Test your knowledge with important Armature Reaction MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Armature Reaction MCQs at Bissoy

• For 6252 AT/Poles, if brush shift is of 2.50 mech. Degrees, what will be the cross-magnetizing ampere-turns per pole for a 6-pole DC machine?
  ক

  521

  খ

  5731

  গ

  5231

  ঘ

  571
• For 6252 AT/Poles, if brush shift is of 2.50 mech. Degrees, what will be the demagnetizing ampere-turns per pole for a 6-pole DC machine?
  ক

  521

  খ

  5731

  গ

  5231

  ঘ

  571
• What is the total ampere turns per pole for 720 lap wounded conductors with carrying armature current equal to 625A in a 6-pole machine?
  ক

  6252 AT/pole

  খ

  625.2 AT/pole

  গ

  62.52 AT/pole

  ঘ

  8252 AT/pole
• If total ampere turns per pole is equal to 6000 A-turns, peak ampere turns for a 4-pole machine is _____
  ক

  24000

  খ

  3000

  গ

  1500

  ঘ

  4500
• What is the total ampere turns/pole (in AT/pole) if 600 lap wound conductors carry 120A current through conductors (P=4)?
  ক

  18000

  খ

  9000

  গ

  4500

  ঘ

  13500
• What is the total ampere conductors/pole (in SI) if 600 lap wound conductors carry 120A current through conductors (P=4)?
  ক

  18000

  খ

  9000

  গ

  4500

  ঘ

  13500
• A 250 kW, 400 V, 6-pole dc generator has 720 lap wound conductors. Armature current is ____
  ক

  625A

  খ

  6.25A

  গ

  62.5A

  ঘ

  0.625A
• Which of the following are effects of armature reaction?
  ক

  Increase in iron losses

  খ

  Commutation problems

  গ

  Possibility of commutator sparking

  ঘ

  Increase in iron losses, commutation problems and commutator sparking
• Armature reaction in a machine is demagnetizing due to _________
  ক

  Machine is designed with iron which is slightly saturated

  খ

  Machine is designed with iron which is unsaturated

  গ

  Depends on the application where machine is being is used

  ঘ

  Can’t tell
• Which axis undergo shifting as a result of armature reaction?
  ক

  GNA

  খ

  MNA

  গ

  Both GNA and MNA

  ঘ

  Remains fixed
• Resultant ampere-turn distribution of a DC machine is given by _________
  ক

  ATresultant(∅) = ATf (∅) – ATa(∅)

  খ

  ATresultant(∅) = – ATf (∅) + ATa(∅)

  গ

  ATresultant(∅) = -ATf (∅) – ATa(∅)

  ঘ

  ATresultant(∅) = ATf (∅) + ATa(∅)
• Flux density in the interpolar region drops down because of ______
  ক

  ATa (peak)

  খ

  Large air gap

  গ

  Absence of magnetic poles

  ঘ

  Depends on other parameters