Corrosion Engineering

20 Questions

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Engineering Quizzes & Trivia

A list of questions related to corrosion engineering which are surely going to boggle your heads !


Questions and Answers
  • 1. 
    Rusting of iron is a typical example for
    • A. 

      Chemical corrosion

    • B. 

      Electrochemical corrosion

    • C. 

      Physical reaction

    • D. 

      None of these

  • 2. 
    Pitting factor of unity represents ____ corrosion.
    • A. 

      Uniform

    • B. 

      Galvanic

    • C. 

      Inter granular

    • D. 

      Fretting

  • 3. 
    Passivity in stainless steel is due to the formation of
    • A. 

      Sulphide film

    • B. 

      Carbide film

    • C. 

      Oxide film

    • D. 

      Chloride film

  • 4. 
    Iron pipe carrying water is more anodic to copper. This is due to
    • A. 

      Concentration cell

    • B. 

      Galvanic cell

    • C. 

      Electrolytic cell

    • D. 

      Leclanche cell

  • 5. 
    The tip and morphology of the crack due to SCC phenomenon will be
    • A. 

      Sharp and transgranular

    • B. 

      Blunt and intergranular

    • C. 

      Blunt and transgranular

    • D. 

      None of these

  • 6. 
    Which of the following metal can be used for cathodic protection of steel
    • A. 

      Al

    • B. 

      Cu

    • C. 

      Ag

    • D. 

      Au

  • 7. 
    In zinc – aluminium galvanic couple, when exposed to acidic solutions
    • A. 

      Zinc dissolves

    • B. 

      Aluminium dissolves

    • C. 

      Both dissolve

    • D. 

      None of these

  • 8. 
    The equation for uniform corrosion is given by : 
    • A. 

      Mpy = 534/(DAT)

    • B. 

      Mpy = 584/(DAT)

    • C. 

      Mpy = (DAT) / 534

    • D. 

      Mpy = (DAT) / 584

  • 9. 
    Typical example for anodic metallic coating is
    • A. 

      Zn on Steel

    • B. 

      Cu on Steel

    • C. 

      Au on steel

    • D. 

      All of these

  • 10. 
    Pourbaix diagram is a graphical plot of
    • A. 

      E Vs pH

    • B. 

      E Vs Log i

    • C. 

      E Vs time

    • D. 

      Current Vs Potential

  • 11. 
    The terminology used for uniform corrosion of nickel and nickel base alloys is
    • A. 

      Tarnishing

    • B. 

      Fogging

    • C. 

      Dulling

    • D. 

      None of these

  • 12. 
    Knife line attack in IGC refers to
    • A. 

      Low temperature HAZ

    • B. 

      High temperature HAZ

    • C. 

      Weld zone

    • D. 

      Base metal

  • 13. 
    Pilling – Bedworth ratio is pertinent to
    • A. 

      Internal oxidation

    • B. 

      High temperature sulphidation

    • C. 

      Catastrophic oxidation

    • D. 

      High temperature oxidation

  • 14. 
    • A. 

      Pitting

    • B. 

      Gasket

    • C. 

      Uniform

    • D. 

      Fretting

  • 15. 
    The sensitization caused in stainless steel for IGC to occur is _____ to corrosive medium
    • A. 

      The prerequisite before exposure

    • B. 

      Post treatment after exposure

    • C. 

      Mere thermal cycle without exposure

    • D. 

      None of these

  • 16. 
    The main cause for the IGC attack in SS is the formation of ____ at the grain boundary.
    • A. 

      Chromium carbide precipitate

    • B. 

      Titanium carbide

    • C. 

      Molybdenum carbide

    • D. 

      Tungsten carbide

  • 17. 
    Experimental setup for stress corrosion cracking should involve ___ application of ultimate tensile stress.
    • A. 

      100%

    • B. 

      0%

    • C. 

      Less than 100%

    • D. 

      None of these

  • 18. 
    The formation of horse-shoe pit is one of the methods of recognizing the occurrence of ____ corrosion.
    • A. 

      Pitting

    • B. 

      Galvanic

    • C. 

      Erosion

    • D. 

      Intergranular

  • 19. 
    The phenomenon of corrosion that occurs on rail roads is _____
    • A. 

      Crevice

    • B. 

      Corrosion fatigue

    • C. 

      High temperature oxidation

    • D. 

      Fretting

  • 20. 
    Catastrophic oxidation is exhibited by metals obeying ____ rate law kinetics.
    • A. 

      Logarithmic

    • B. 

      Parabolic

    • C. 

      Linear

    • D. 

      Cubic