Commutation Process MCQ

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

• Ideal commutation can be shown graphically by _____________
  ক

  Straight line passing through origin

  খ

  Straight line not passing through origin but with +ve slope

  গ

  Straight line not passing through origin but with -ve slope

  ঘ

  Curve increasing towards +ve t axis
• Which coil is shorted in commutation process?
  ক

  Coil under north pole

  খ

  Coil under south pole

  গ

  Coil lying in an interpolar region

  ঘ

  Cannot be determined
• How many coil sets undergo commutation simultaneously in a wave winding?
  ক

  1

  খ

  2

  গ

  4

  ঘ

  3
• The process of current reversal takes place when the coil is passing through the interpolar region.
  ক

  True

  খ

  False
• In wave winding, P/2 coils are connected under the influence of “x” pole-pairs which connect adjacent segments. X is ____
  ক

  P

  খ

  P/2

  গ

  2P

  ঘ

  P/4
• How many coils under an adjoining pole pairs is/are connected between adjacent commutator segments in lap winding?
  ক

  1/2

  খ

  2

  গ

  1

  ঘ

  1/4
• Which of the following is different component?
  ক

  Commutating poles

  খ

  Compoles

  গ

  Interpoles

  ঘ

  Compensating winding
• The main function of interpoles in a loaded DC machine is to minimize _______between the brushes and the commutator.
  ক

  Friction

  খ

  Sparking

  গ

  Current

  ঘ

  Wear and tear
• Why interpoles are tapered in a DC machine?
  ক

  Simpler design

  খ

  Reduction in the weight

  গ

  Increase in acceleration of commutation

  ঘ

  Cannot be determined
• The insulating material used between the commutator segments is normally _______
  ক

  Graphite

  খ

  Paper

  গ

  Air gap

  ঘ

  Mica
• For a DC machine, in a commutator ________
  ক

  Copper is harder than mica

  খ

  Mica and copper are equally hard

  গ

  Mica is harder than copper

  ঘ

  Cannot be determined
• If in the DC machine, the reversal of current in the coil is faster than ideal or linear commutation then the commutation is said to be __________ commutation.
  ক

  Retarded

  খ

  Curvilinear

  গ

  Accelerated

  ঘ

  Under
• To achieve spark less commutation brushes of a DC generator are placed ________
  ক

  just ahead of magnetic neutral axis

  খ

  in magnetic neutral axis

  গ

  just behind the magnetic neutral axis

  ঘ

  can be placed anywhere