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Commutator (electric): Quiz

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Question 1: A commutator is a rotary electrical switch in certain types of ________ or electrical generators that periodically reverses the current direction between the rotor and the external circuit.
Motor controllerInduction motorElectric motorAC motor

Question 2: What does the following picture show?

  Various types of copper and carbon brushes.[2]
  Actual position of the commutating plane to compensate for field distortion.[10]
  Compound carbon brush holder, with individual clamps and tension adjustments for each block of carbon.[4]

Question 3: By reversing the current direction in the moving coil of a motor's armature, a steady rotating force (________) is produced.
TorqueRigid body dynamicsEnergyAngular momentum

Question 4: What does the following picture show?

  Commutating plane definitions.[6]
  Cross-section of a commutator that can be disassembled for repair.[1]
  Actual position of the commutating plane to compensate for field distortion.[10]
  Actual position of the commutating plane to compensate for field distortion.[10]

Question 5: What does the following picture show?

  Compound carbon brush holder, with individual clamps and tension adjustments for each block of carbon.[4]
  Cross-section of a commutator that can be disassembled for repair.[1]
  Brush advance for Self-Induction.[12]

Question 6: What does the following picture show?

  Actual position of the commutating plane to compensate for field distortion.[10]
  Cross-section of a commutator that can be disassembled for repair.[1]
  Brush advance for Self-Induction.[12]
  Compound carbon brush holder, with individual clamps and tension adjustments for each block of carbon.[4]

Question 7: Later materials research into ________ brought the development of plastic spacers which are more durable and less prone to cracking, and have a higher and more uniform breakdown voltage than mica.
Polymer chemistryNylonPolymerPolyethylene

Question 8: The current in the winding causes the fixed magnetic field to exert a rotational force (a ________) on the winding, making it turn.
Rigid body dynamicsTorqueEnergyAngular momentum

Question 9: Initially when the technology was first developed, ________ was used as an insulator between commutation segments.
MuscoviteMicaBiotiteSerpentine group

Question 10: A commutator typically consists of a set of ________ segments, fixed around part of the circumference of the rotating part of the machine (the rotor), and a set of spring-loaded brushes fixed to the stationary frame of the machine.
GoldSilverPalladiumCopper







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