Engmat Final Year Set 4

37 Questions

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Eng mat final yearnext 40 question set 4


Questions and Answers
  • 1. 
    Temper brittleness is a feature of: 
    • A. 

      Austenitic stainless steel.

    • B. 

      High carbon

    • C. 

      Steel

  • 2. 
    In magnetic particle inspection, a flaw that is perpendicular to the magnetic field flux lines generally causes? 
    • A. 

      A large disruption in the magnetic field

    • B. 

      A minimal disruption in the magnetic field

    • C. 

      No disruption in the magnetic field

  • 3. 
    Normalising is a process of heat treating
    • A. 

      Aluminum alloys only

    • B. 

      Iron-base metals only

    • C. 

      Both aluminum alloys and iron-base metals

  • 4. 
    Which of the following describes the intraply form in composite?
    • A. 

      Two or more different fibers are stacked in alternating layers

    • B. 

      Different fibers are intermixed within the same layer

    • C. 

      Fibers are selectively placed within the matrix

  • 5. 
    Pure aluminium has:
    • A. 

      Low corrosion resistance.

    • B. 

      Reasonable corrosion resistance.

    • C. 

      Very high corrosion resistance

  • 6. 
    "Alcad" is the trade name for:
    • A. 

      Pure aluminium sheet, clad with 5% thickness of Duralumin on each side.

    • B. 

      Duralumin sheet, clad with 5% thickness of pure aluminium on each side.

    • C. 

      Duralumin sheet, clad with 2.5% thickness of zinc on each side

  • 7. 
    Plastics materials are most prone to deterioration from: 
    • A. 

      Moisture

    • B. 

      Ultra-violet radiation

    • C. 

      Low ambient temperatures

  • 8. 
    Which of the following element increases corrosion resistant to steel? 
    • A. 

      Carbon

    • B. 

      Chromium

    • C. 

      Silicon

  • 9. 
    Which of the following are general characteristics of carbon/graphite fiber composites?1Flexibility2Stiffness3High compressive strength4Corrosive effect in contact with aluminum5Ability to conduct electricity
    • A. 

      1 & 3

    • B. 

      2, 3 & 4

    • C. 

      1, 3 & 5

  • 10. 
    Select a characteristic of a good gas weld 
    • A. 

      The depth of penetration shall be sufficient to ensure fusion of the filler rod

    • B. 

      The height of the weld bead should be 1/8 inch above the base metal

    • C. 

      The weld should taper off smoothly into the base of the metal

  • 11. 
    What method of magnetic particle inspection is used most often to inspect aircraft parts for invisible cracks and other defects?
    • A. 

      Residual

    • B. 

      Inductance

    • C. 

      Continuous

  • 12. 
    Which of the following is a thermosetting polymer?
    • A. 

      Nylon

    • B. 

      Acrylic

    • C. 

      Polyester

  • 13. 
    In the designation of tool steels, the alphabet "S" represents?
    • A. 

      Shock resisting, low carbon, low alloy steels

    • B. 

      Shock resisting, medium carbon, low alloy steels

    • C. 

      Shock resisting, high carbon, low alloy steels

  • 14. 
    Which of the following material is amorphous?
    • A. 

      Aluminum

    • B. 

      Copper

    • C. 

      Glass

  • 15. 
    When nickel is added to steel its main effect is to increase:
    • A. 

      Toughness.

    • B. 

      Hardness.

    • C. 

      Corrosion resistance

  • 16. 
    A satin weave would be stronger than a plain woven material because: 
    • A. 

      All the fibres lay in a warp direction

    • B. 

      There is less crimp

    • C. 

      The fibres are equally divided in two directions

  • 17. 
    Which of the following flame in oxyacetylene welding will cause a reduction in ductility when used on carbon steels? 
    • A. 

      Neutral

    • B. 

      Oxidising

    • C. 

      Carburising

  • 18. 
    Which of the following stainless steels have the highest percentage of carbon?
    • A. 

      Ferritic stainless steels

    • B. 

      Austenitic stainless steels

    • C. 

      Martensitic stainless steels

  • 19. 
    In performing a dye penetrant inspection, the developer?
    • A. 

      Seeps into the surface crack to indicate the presence of a defect

    • B. 

      Acts as a blotter to produce a visible indication

    • C. 

      Thoroughly cleans the surface prior to the inspection

  • 20. 
    Carburizing and nitriding affect the metal's surface by adding?
    • A. 

      Toughness

    • B. 

      Hardness

    • C. 

      Ductility

  • 21. 
    The main constituent in the refractory "super-alloy", such as Nimonic 80A is:
    • A. 

      Nickel.

    • B. 

      Chronium.

    • C. 

      Tungsten

  • 22. 
    One way of obtaining increased resistance to stress corrosion cracking is by 
    • A. 

      Relievng compressive stresses on the metal surface

    • B. 

      Creating compressive stresses on the metal surface

    • C. 

      Producing non uniform deformation while cold working during the manufacturing process

  • 23. 
    Which of the following describes the interply form in composite?
    • A. 

      Two or more different fibers are stacked in alternating layers

    • B. 

      Different fibers intermixed within the same layer

    • C. 

      Fibers are selectively placed within the matrix

  • 24. 
    Atoms that vary from the noramal atomic mass found in naturally occurring forms of the elements are called?
    • A. 

      Quantropes

    • B. 

      Isotopes

    • C. 

      Multitropes

  • 25. 
    Once cured, if further heat is applied to a thermosetting material, it will?
    • A. 

      Be reshaped

    • B. 

      Be burned

    • C. 

      Be rehardened

  • 26. 
    Low carbon steel is normally used in which of these applications?
    • A. 

      Machine tools

    • B. 

      Castings

    • C. 

      Structural and sheets

  • 27. 
    A light alloy that would be most suited for an aircraft skin that has a working temperature of 180 degrees Centigrade is:
    • A. 

      Duralumin

    • B. 

      Titanium alloy

    • C. 

      Aluminium - magnesium alloy

  • 28. 
    In organic coatings, the liquid portion of the coating is known as?
    • A. 

      Base

    • B. 

      Vehicle

    • C. 

      Pigment

  • 29. 
    Mild steel components used on aircraft are normally protected by:
    • A. 

      Cadmium plating.

    • B. 

      Anodising.

    • C. 

      Metal spraying

  • 30. 
    Dispersion hardening is a process where:
    • A. 

      Particles of ceramic materials lock the slip planes in cermets

    • B. 

      Carbides are cemented to the tips of cutting tools

    • C. 

      Micro-ballons are added to resins to harden them

  • 31. 
    Damaged honeycomb core is removed from a panel by:
    • A. 

      Drilling

    • B. 

      Routing

    • C. 

      Mechanical sanding

  • 32. 
    Which of the following is NOT a condition for polymerization to occur?
    • A. 

      A molecule must have at least two locations that have unsatisfied bonds

    • B. 

      A molecule must have at least two locations that have satisfied bonds

    • C. 

      After each reaction, at least two open conditions must remain

  • 33. 
    When checking an item with the magnetic particle inspection method, circular and longitudinal magnetization should be used to?
    • A. 

      Reveal all possible defects

    • B. 

      Evenly magnetize the entire part

    • C. 

      Ensure uniform current flow

  • 34. 
    A suitable material use in an aircraft landing gear structure would be:
    • A. 

      High carbon steel

    • B. 

      Tungsten, cobalt alloy steel.

    • C. 

      Chrome, molybdenum alloy steel

  • 35. 
    The thin layer that forms on the weld that protects the weld pool from further oxidation is called the?
    • A. 

      Shield

    • B. 

      Slag

    • C. 

      Screen

  • 36. 
    Which of the following is NOT a method for producing pure metallic chromium metal?
    • A. 

      Aluminmothermically

    • B. 

      Electrolytically

    • C. 

      Chromiumothermically

  • 37. 
    Which of the following additive will induce cross-linking in a polymer? 
    • A. 

      Platicizer

    • B. 

      Catalyst

    • C. 

      Lubricant