Engmat Final Year Set 3

38 Questions | Total Attempts: 31

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Year Quizzes & Trivia

Engmat final year set 3Third set of 40 questions


Questions and Answers
  • 1. 
    Which of the following is NOT a natural adhesive? 
    • A. 

      Soybean glue

    • B. 

      Mucilage

    • C. 

      Cellulose

  • 2. 
    When a cracked component is subjected to tensile stress the tip of the crack will: 
    • A. 

      Become more cathodic and the rate of corrosion at the tip will decrease.

    • B. 

      Become more anodic and the rate of the corrosion at the tip will increase.

    • C. 

      Become more anodic and the rate of corrosion at the crack walls will increase.

  • 3. 
    How many of these factors are considered essential knowledge for x-ray exposure?   1 Processing of the film 2 Material thickness and density 3 Exposure distance and angle 4 Film characteristics 
    • A. 

      1

    • B. 

      3

    • C. 

      4

  • 4. 
    The letter that accompanies a Rockwell hardness value (HR) indicates the: 
    • A. 

      Material tested.

    • B. 

      Additional force used.

    • C. 

      Scale used.

  • 5. 
    The Society of Automotive Engineers (SAE) and the American Iron and Steel Institute (AISI) use a numerical index system to identify the composition of various steels. In the number "4130" designating chronium 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

  • 6. 
    Which of the following additive will enhance the mechanical property of a polymer? 
    • A. 

      Filler

    • B. 

      Plasticizer

    • C. 

      Lubricant

  • 7. 
    The heat treatment that softens steel and makes it more ductile is called: 
    • A. 

      Tempering

    • B. 

      Annealing

    • C. 

      Normalising.

  • 8. 
    Which of the element will gives the steel high strength at high temperatures? 
    • A. 

      Aluminum

    • B. 

      Sulfur

    • C. 

      Titanium

  • 9. 
    Annealing of aluminum 
    • A. 

      Increases the tensile strength

    • B. 

      Makes the material brittle

    • C. 

      Removes stresses caused by forming

  • 10. 
    The rust or corrosion that occurs with most metals is the result of 
    • A. 

      A tendency for them to return to their natural state

    • B. 

      Blocking the flow of electrons in homogenous metals, or between dissimiliar metals

    • C. 

      Electron flow in or between metals from cathodic to anodic areas

  • 11. 
    A polymer that cannot be re-moulded by heat once it it has cured is classed as a: 
    • A. 

      Thermoplastic

    • B. 

      Thermoset

    • C. 

      Elastomer

  • 12. 
    When raising the temperature of a cold cure repair to hasten curing, the upper temperature limit is approximately 
    • A. 

      265 degrees

    • B. 

      25 degrees

    • C. 

      65 degrees

  • 13. 
    What aluminum alloy designations indicate that the metal has received no hardening or tempering treatment? 
    • A. 

      3003-F

    • B. 

      5052-H36

    • C. 

      6061-O

  • 14. 
    Malleable cast irons are heat treated versions of which of the following? 
    • A. 

      Grey cast iron

    • B. 

      White cast iron

    • C. 

      Ductile cast iron

  • 15. 
    In the four-digit aluminum index system number 2024, the first digit indicates 
    • A. 

      The major alloying element

    • B. 

      The number of major alloying elements used in the metal

    • C. 

      The percent of alloying metal added

  • 16. 
    Sintering is a process that involves: 
    • A. 

      The bonding of molecules by cross-linking with catalysts

    • B. 

      Breaking molecular bonds during polymerisation

    • C. 

      The cold fusion and heat treatment of powdered materials

  • 17. 
    Following the solution treatment of Duralumin, refrigeration will: 
    • A. 

      Delay age hardening.

    • B. 

      Accelerate age hardening.

    • C. 

      Have no affect on age hardening.

  • 18. 
    When the surface of aluminium is exposed to air it will oxidise and become: 
    • A. 

      Less electrically conducive.

    • B. 

      More electrically conducive.

    • C. 

      Electrically insulated.

  • 19. 
    When an aluminium conductor gets hot its oxide layer will: 
    • A. 

      Become thinner.

    • B. 

      Become thicker.

    • C. 

      Not be affected

  • 20. 
    Wetting the surface happens when? 
    • A. 

      The forces between adhesive molecules and base molecules are the same

    • B. 

      The forces between adhesive molecules and base molecules are greater than between the adhesive molecules

    • C. 

      The forces between adhesive molecules and base molecules are lesser than between the adhesive molecules

  • 21. 
    What non destructive testing method requires little or no part preparation, is used to detect surface or near surface defects in most metals, and may also be used to separate metals or alloys and their heat treatment conditions? 
    • A. 

      Eddy current inspection

    • B. 

      Ultrasonic inspection

    • C. 

      Magnetic particle inspection

  • 22. 
    Cadmium is added as an alloy in Copper to?
    • A. 

      Resist corrosion at high temperature

    • B. 

      Resist softening at high temperature

    • C. 

      Resist embrittlement at high temperature

  • 23. 
    Which of the following is NOT a characteristic for increasing carbon in steel?
    • A. 

      Increasing cost

    • B. 

      Increasing melting point

    • C. 

      Increasing brittleness

  • 24. 
    Which is the most abundant metal in the earth?s crust?
    • A. 

      Aluminum

    • B. 

      Copper

    • C. 

      Tin

  • 25. 
    Grey cast iron is normally used in which of the following application because of its compression strength?
    • A. 

      Machine base

    • B. 

      Hammers and chisels

    • C. 

      Machining tools