Lubricants and Surface Contact Quiz
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Questions and Answers

What causes the weed junction between two surfaces?

  • Interlocking of surface irregularities
  • Friction caused by sliding of two materials
  • Rolling of a load sphere or cylinder over a flat surface
  • Contact of asperities of both upper and lower surfaces (correct)
  • Which type of friction results in ploughing and interlocking of surface irregularities?

  • Friction caused by the contact of asperities
  • Sliding friction (correct)
  • Rolling friction
  • Friction caused by the sliding of two materials of different hardness
  • What is the relative movement of two surfaces in contact with each other called?

  • Contact deformation
  • Slide junction
  • Weed junction
  • Friction (correct)
  • What gets broken easily due to sliding friction?

    <p>Peaks of the softer metal</p> Signup and view all the answers

    In which type of friction does a load sphere or cylinder roll over a flat surface?

    <p>Rolling friction</p> Signup and view all the answers

    What is the main cause of carrying all the loads between two surfaces?

    <p>Weed junction</p> Signup and view all the answers

    What is the main reason for the lower effect of rolling friction compared to sliding friction?

    <p>The coefficient of rolling friction is usually very low.</p> Signup and view all the answers

    Which characteristic should a lubricant possess in order to reduce friction between two moving surfaces?

    <p>Low carbon residue</p> Signup and view all the answers

    Where are solid lubricants commonly used?

    <p>For heavy machinery working at very high loads</p> Signup and view all the answers

    What is the main characteristic of graphite, a widely used solid lubricant?

    <p>Has a layered structure of carbon atoms</p> Signup and view all the answers

    In which type of friction is the lubricant less important according to the given information?

    <p>Rolling friction</p> Signup and view all the answers

    Which type of lubricant classification includes graphite and molybdenum sulphide?

    <p>Solid lubricants</p> Signup and view all the answers

    What type of bond holds the adjacent layers of carbon atoms together in graphite?

    <p>Vanderwaals force</p> Signup and view all the answers

    In which condition is the coefficient of sliding friction much larger according to the text?

    <p>Static condition</p> Signup and view all the answers

    What happens if the frictional heat reaches the melting temperature of the material, according to the text?

    <p>It forms a welded junction.</p> Signup and view all the answers

    What should be the flash and fire points of a lubricant in comparison to the operating temperature of the machine?

    <p>Higher than the operating temperature</p> Signup and view all the answers

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