Composite Structures And Transparent Plastic Materials

58 Questions | Total Attempts: 266

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Composite Structures And Transparent Plastic Materials

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Questions and Answers
  • 1. 
    Metal fasteners used with carbon/graphite composite structures
    • A. 

      Must be constructed of high strength aluminum-lithium alloy

    • B. 

      Must be constructed of material such as titanium or corrosion resistant steel

    • C. 

      May be constructed of any of the metals commonly used in aircraft fasteners.

  • 2. 
    Hole filling fasteners (for example, MS20470 rivets) should not be used in composite structures primarily because of the
    • A. 

      Possibility of causing delamination

    • B. 

      Difficulty in forming a proper shop head.

    • C. 

      Increased possibility of fretting corrosion in the fastener

  • 3. 
    Sandwich panels made of metal honeycomb construction are used on modern aircraft because this type of construction
    • A. 

      May be repaired by gluing replacement skin to the inner core material with thermoplastic resin

    • B. 

      Has a high strength to weight ratio.

    • C. 

      Is lighter than single sheet skin of the same strength and is more corrosion resistant

  • 4. 
    (1) When performing a ring (coin tap) test on composite structures, a change in sound may be due to damage or to transition to a different internal structure.(2) The extent of separation damage in composite structures is most accurately measured by a ring (coin tap) test.
    • A. 

      Only No.1 is true

    • B. 

      Only No.2 is true

    • C. 

      Both No.1 and No.2 are true

  • 5. 
    Which of these methods may be used to inspect fiberglass/ honeycomb structures for entrapped water?1. Acoustic emission monitoring2. X-ray3. Backlighting
    • A. 

      1 and 2

    • B. 

      2 and 3

    • C. 

      1 and 3

  • 6. 
    One of the best ways to assure that a properly prepared batch of matrix resin has been achieved is to
    • A. 

      Perform a chemical composition analysis

    • B. 

      Have mixed enough for a test sample

    • C. 

      Test the viscosity of the resin immediately after mixing

  • 7. 
    Composite inspections conducted by means of acoustic emission monitoring
    • A. 

      Pick up the "noise" of corrosion or other deterioration occurring

    • B. 

      Create sonogram pictures of the areas being inspected

    • C. 

      Analyze ultrasonic signals transmitted into the parts being inspected

  • 8. 
    What precaution, if any, should be taken to prevent corrosion inside a repaired metal honeycomb structure?
    • A. 

      Prime the repair with a corrosion inhibitor and seal from the atmosphere

    • B. 

      Paint the outside area with several coats of exterior paint

    • C. 

      None. Honeycomb is usually made from a man made or fibrous material which is not susceptible to corrosion.

  • 9. 
    One method of inspecting a laminated fiberglass structure that has been subjected to damage is to
    • A. 

      Strip the damaged area of all paint and shine a strong light through the structure

    • B. 

      Use an eddy current probe on both sides of the damaged area

    • C. 

      Use dye penetrant inspection procedures, exposing the entire damaged area to the penetrant solution.

  • 10. 
    How many of the following are benefits of using microballons when making repairs to laminated honeycomb panels?
    1. Greater concentrations of resin in edges and corners.
    2. Improved strength to weight ratio.
    3. Less density.
    4. Lower stress concentrations.
    • A. 

      2, 3, and 4

    • B. 

      1, 2, and 4

    • C. 

      1, 3, and 4

  • 11. 
    The length of time that a catalyzed resin will remain in a workable state is called the
    • A. 

      Pot life

    • B. 

      Service life

    • C. 

      Shelf life

  • 12. 
    A category of plastic material that is capable of softening or flowing when reheated is described as a
    • A. 

      Thermoset

    • B. 

      Thermoplastic

    • C. 

      Thermocure

  • 13. 
    The classification for high tensile strength fiberglass used in aircraft structures is
    • A. 

      S

    • B. 

      G

    • C. 

      E

  • 14. 
    Superficial scars, scratches, surface abrasion, or rain erosion on fiberglass laminates can generally be repaired by applying
    • A. 

      A piece of resin impregnated glass fabric facing.

    • B. 

      One or more coats of suitable resin (room temperature catalyzed) to the surface.

    • C. 

      A sheet of polyethylene over the abraded surface and one or more coats of resin cured with infrared heat lamps

  • 15. 
    The classification for fiberglass reinforcement material that has high resistivity and is the most common is
    • A. 

      E

    • B. 

      G

    • C. 

      S

  • 16. 
    A potted compound repair on honeycomb can usually be made on damages less than
    • A. 

      2 inches in diameter

    • B. 

      1 inches in diameter

    • C. 

      4 inches in diameter

  • 17. 
    Composite fabric material is considered to be the strongest in what direction?
    • A. 

      Fill

    • B. 

      Bias

    • C. 

      Warp

  • 18. 
    The strength and stiffness of a properly constructed composite buildup depends primarily on
    • A. 

      The orientation of the plies to the load direction.

    • B. 

      The ability of the fibers to transfer stress to the matrix

    • C. 

      A 60 percent matrix to 40 percent fiber ratio

  • 19. 
    Which fiber to resin (percent) ratio for advanced composite wet lay-ups is generally considered the best for strength?
    • A. 

      60:40

    • B. 

      40:60

    • C. 

      50:50

  • 20. 
    What is the material layer used within the vacuum bag pressure system to absorb excess resin during curing called?
    • A. 

      Release

    • B. 

      Bleeder

    • C. 

      Breather

  • 21. 
    Proper pre-preg composite lay-up curing is generally accomplished by
    1. applying external heat
    2. room temperature exposure
    3. adding a catalyst or curing agent to the resin
    4. applying pressure
    • A. 

      1 and 4

    • B. 

      2 and 3

    • C. 

      1, 3, and 4

  • 22. 
    When repairing large, flat surfaces with polyester resins, warping of the surface is likely to occur. One method of reducing the amount of warpage is to
    • A. 

      Use less catalyst than normal so the repair will be more flexible.

    • B. 

      Add an extra amount of catalyst to the resin

    • C. 

      Use short strips of fiberglass in the bonded repair

  • 23. 
    When making repairs to fiberglass, cleaning of the area to be repaired is essential for a good bond. The final cleaning should be made using
    • A. 

      MEK (methyl ethyl ketone)

    • B. 

      A thixotropic agent.

    • C. 

      Soap, water, and a scrub brush

  • 24. 
    When necessary, what type of cutting fluid is usually acceptable for machining composite laminates?
    • A. 

      Water only

    • B. 

      Water displacing oil

    • C. 

      Water soluble oil

  • 25. 
    Fiberglass laminate damage not exceeding the first layer or ply can be repaired by
    • A. 

      Sanding the damaged area until aerodynamic smoothness is obtained

    • B. 

      Trimming the rough edges and sealing with paint

    • C. 

      Filling with a putty consisting of a compatible resin and clean, short glass fibers

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