Materials And Processes

18 Questions  I  By Dr3wee
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Material Quizzes & Trivia

  
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  • 1. 
    Which of the following descirbe the effects of annealing steel and aluminum alloys?
    • A. 

      Decrease in internal stress.

    • B. 

      Softening of the metal.

    • C. 

      1 and 2.

    • D. 

      Tempering.


  • 2. 
    Which heat-treating process of metal produces a hard wear-resistant surface over a strong, tough core?
    • A. 

      Case hardening.

    • B. 

      Annealing.

    • C. 

      Tempering


  • 3. 
    Which heat-treating operation would be performed when the surface of the metal is changed chemically by introducing a high carbide or nitride content?
    • A. 

      Tempering

    • B. 

      Normalizing

    • C. 

      Case hardening


  • 4. 
    Normalizing is a process of heat treating
    • A. 

      Aluminum alloys only

    • B. 

      Iron base metals only

    • C. 

      Both aluminum alloys and iron-base metals


  • 5. 
    Which of the following occurs when a mechanical force is repeatedly applied to most metals at room temperature, such as rolling, hammering, or bending?
    • A. 

      The metals become artificially aged.

    • B. 

      The metals become stress corrosion cracked.

    • C. 

      The metals become cold worked, strain or work hardened.


  • 6. 
    The reheating of a heat treated metal, such as with a welding torch
    • A. 

      Has little or no effect on a metal's heat treated characteristics.

    • B. 

      Can significantly alter a metal's properties in the reheated area.

    • C. 

      Has a cumulative enhancement effect on the original heat treatment.


  • 7. 
    Why is steel tempered after being hardened?
    • A. 

      To increase its hardness and ductility.

    • B. 

      To increase its strength and decrease its internal stresses.

    • C. 

      To relieve its internal stresses and reduce its brittleness.


  • 8. 
    What aluminum alloy designations indicate that the metal has recieved no hardening or tempering treatment?
    • A. 

      3003-F

    • B. 

      5052-H36

    • C. 

      6061-O


  • 9. 
    Which material cannot be heat treated repeatedly without harmful effects?
    • A. 

      Unclad aluminum alloy in sheet form.

    • B. 

      6061-T9 stainless steel.

    • C. 

      Clad aluminum alloy.


  • 10. 
    What is descriptive of the annealing process of steel during and after it has been annealed?
    • A. 

      Rapid cooling; high strength

    • B. 

      Slow cooling; low strength

    • C. 

      Slow cooling; increased resistance to wear.


  • 11. 
    What is generally used in the construction of aircraft engine firewalls?
    • A. 

      Stainless Steel.

    • B. 

      Chrome-molybdenum alloy steel.

    • C. 

      Titanium Nickel alloy.


  • 12. 
    Alclad is a metal consisting of 
    • A. 

      Aluminum alloy surface layers and a pure aluminum core.

    • B. 

      Pure aluminum surface layers on an aluminum alloy core.

    • C. 

      A homogeneous mixture of pure aluminum and aluminum alloy.


  • 13. 
    The SAE and the American Iron and Steel Institute use a numerical index system to identify the compostion of various steels. In the number "4130", designating Chromium Molybdenum steel, the first digit indicates the
    • A. 

      Percentage of the basic element in the alloy.

    • B. 

      Percentage of carbon in the alloy in hundredths of a percent.

    • C. 

      Basic alloying element


  • 14. 
    The core material of Alclad 2024-T4 is
    • A. 

      Heat-treated aluminum alloy, and the surface material is commercially pure aluminum.

    • B. 

      Commercially pure aluminum, and the surface material is heat-treated aluminum alloy.

    • C. 

      Strain-hardened aluminum alloy, and the surface material is commercially pure aluminum.


  • 15. 
    The aluminum code number 1100 identifies what type of aluminum?
    • A. 

      Aluminum alloy containing 11 perfect copper.

    • B. 

      Aluminum alloy containing zinc.

    • C. 

      99 percent commercially pure aluminum.


  • 16. 
    In the four-digit aluminum index system number 2024, the first digit indicates 
    • A. 

      The major alloying element.

    • B. 

      The number of different major alloying elements used in the metal.

    • C. 

      The percent of alloying metal added.


  • 17. 
    Why is it considered good practice to normalize a part after welding?
    • A. 

      To relieve internal stresses developed within the base metal.

    • B. 

      To increase the hardness of the weld.

    • C. 

      To remve the surface scale formed during welding.


  • 18. 
    Parts are rinsed thoroughly in hot water after they have been heat treated in a sodium and potassium nitrite bath to
    • A. 

      Prevent corrosion.

    • B. 

      Prevent surface cracking.

    • C. 

      Retard discoloration.


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