EASA Part 66 : Material Question10
Question Number. 41. The Alocrom 1200 process was designed to treat. Option A. chromium plating. Option B. small surfaces. Option C. surfaces too large for dip treatment.
Correct Answer is. small surfaces. Explanation. NIL.
Question Number. 13. What action is taken to protect integral tanks from corrosion due to micro-biological growth?. Option A. The inside of the tank is coated with yellow chromate. Option B. Rubber liners are installed in the tank. Option C. A biocidal additive is used in the fuel.
Correct Answer is. A biocidal additive is used in the fuel. Explanation. NIL.
Question Number. 52. Aluminium alloy parts are often protected by the. Option A. Alocrom plating. Option B. chromium plating process. Option C. Alocrom 1200 process.
Correct Answer is. Alocrom 1200 process. Explanation. NIL. http://www.amberelect.co.uk/page12.htm
Question Number. 59. Which of the following are acceptable to use in cleaning anodized surfaces?. Option A. Steel wool, aluminium wool, fibre bristle brush. Option B. Aluminium wool, fibre bristle brush. Option C. Brass wire brush, stainless steel wire brush.
Correct Answer is. Aluminium wool, fibre bristle brush. Explanation. NIL.
Question Number. 56. Which anti-corrosion chemical treatment is normally applied to aluminium alloys?. Option A. Pure aluminium. Option B. Anodising. Option C. Cadmium.
Correct Answer is. Anodising. Explanation. Alclad is not considered a chemical treatment.
Question Number. 2. What are the signs of fretting corrosion?. Option A. Black powder or cocoa staining. Option B. Intergranular cracking. Option C. Flaking.
Correct Answer is. Black powder or cocoa staining. Explanation. CAIP BL/4-1 para 3.1.5.
Question Number. 12. What is the indication of fretting corrosion on aluminium alloy?. Option A. Black powder. Option B. Brown powder. Option C. White powder.
Correct Answer is. Black powder. Explanation. Fretting corrosion is identified by a black / grey powder streak.
Question Number. 55. Which of the following is a temporary protective measure?. Option A. Sacrificial protection. Option B. Chromating. Option C. Paint finish.
Correct Answer is. Chromating. Explanation. NIL.
Question Number. 27. What is used to remove corrosion from magnesium?. Option A. Phosphate acid solution. Option B. Chromic acid solution. Option C. Sulphuric acid solution.
Correct Answer is. Chromic acid solution. Explanation. Chromic acid solution is used to remove corrosion from magnesium alloys. AC43 6-31.
Question Number. 6. Active flux does what?. Option A. Protects. Option B. Cleans. Option C. Both cleans and protects.
Correct Answer is. Cleans. Explanation. NIL.
Question Number. 1. What sort of corrosion would a magneto be likely to encounter if completely enclosed?. Option A. None, providing the magneto is completely enclosed. Option B. Direct chemical attack. Option C. Pitting.
Correct Answer is. Direct chemical attack. Explanation. BL/4-1 3.1.8.
Question Number. 37. Intergranular corrosion is also known as what?. Option A. Stress corrosion. Option B. Exfoliation. Option C. Galvanic.
Correct Answer is. Exfoliation. Explanation. BL/4-1 2.3.3 '[exfoliation is] A less harmful form of intergranular attack'.
Question Number. 40. Anodising is a form of. Option A. artificial protection. Option B. metallic coating. Option C. sacrificial protection.
Correct Answer is. artificial protection. Explanation. NIL.
Question Number. 28. Surface corrosion on stainless steel is identified by. Option A. red rust. Option B. white film. Option C. black pitting.
Correct Answer is. black pitting. Explanation. Surface corrosion on stainless steel is a black pitting. AC43 6-5.
Question Number. 54. Corrosion on a copper alloy can be recognised by. Option A. blue/green deposit. Option B. white deposit. Option C. grey deposit.
Correct Answer is. blue/green deposit. Explanation. NIL.
Question Number. 33. The usual manufacturers anti-corrosion process to be applied to Fe aircraft parts is. Option A. cadmium plating. Option B. anodising. Option C. metal spraying.
Correct Answer is. cadmium plating. Explanation. NIL.
Question Number. 22. Heavy corrosion deposits on clad aluminium alloys should be removed. Option A. mechanically using a pneumatic vibrator. Option B. chemically by use of trichloroethylene. Option C. chemically by use of phosphoric acid.
Correct Answer is. chemically by use of phosphoric acid. Explanation. BL/4-2 2.4.3(ii).
Question Number. 21. A type of protection which is applicable to magnesium alloys is the. Option A. phosphate process. Option B. chromating process. Option C. coslettising process.
Correct Answer is. chromating process. Explanation. NIL.
Question Number. 35. Anti-corrosion treatment used on Magnesium is. Option A. chromating. Option B. electro-plating. Option C. phosphating.
Correct Answer is. chromating. Explanation. BL/4-3 3.1.3.
Question Number. 44. When cleaning aircraft faying surfaces, a cause for concern is. Option A. corrosion acting on the end faces of panels. Option B. sharp corners etc trapping corrosive chemicals. Option C. leaks into the fuselage.
Correct Answer is. corrosion acting on the end faces of panels. Explanation. NIL.
Question Number. 38. During construction, sharp internal corners and inaccessible places should be avoided to reduce. Option A. filiform corrosion. Option B. fretting corrosion. Option C. crevice corrosion.
Correct Answer is. crevice corrosion. Explanation. NIL.
Question Number. 10. The lifting or flaking of the metal at the surface due to delamination of grain boundaries caused by the pressure of corrosion is. Option A. exfoliation. Option B. electrolysis. Option C. transgranulation.
Correct Answer is. electrolysis. Explanation. NIL.
Question Number. 3. Black streaks back from a rivet hole signify. Option A. galvanic corrosion. Option B. intergrannular corrosion. Option C. fretting.
Correct Answer is. fretting. Explanation. Fretting corrosion is identified by black / grey streaks. BL/4-1 3.1.5.
Question Number. 48. Corrosion on copper is identified by. Option A. red/brown rust. Option B. black powder. Option C. green discolouration.
Correct Answer is. green discolouration. Explanation. NIL.
Question Number. 57. Spilled mercury on aluminium causes. Option A. greyish powder, fuzzy deposit or whiskery growth. Option B. yellowish stains on surface of the metal. Option C. black pits going into brown rust.
Correct Answer is. greyish powder, fuzzy deposit or whiskery growth. Explanation. BL/4-10 2.3 (i).
Question Number. 17. Corrosion will spread more rapidly when metals are exposed to. Option A. dry climates. Option B. cold climates. Option C. high temperatures.
Correct Answer is. high temperatures. Explanation. Higher temperatures always accelerate corrosion. AC43 6-3.
Question Number. 60. A primary cause of intergranular corrosion is. Option A. improper heat treatment. Option B. improper application of primer. Option C. dissimilar metal contact.
Correct Answer is. improper heat treatment. Explanation. NIL.
Question Number. 50. When examining a piece of metal through a magnifying glass, hair line cracks would indicate. Option A. crevice corrosion. Option B. intergrannular corrosion. Option C. surface corrosion.
Correct Answer is. intergrannular corrosion. Explanation. NIL.
Question Number. 25. Corrosion at the grain boundaries is called. Option A. intergrannular. Option B. fretting. Option C. filiform.
Correct Answer is. intergrannular. Explanation. NIL.
Question Number. 32. Intercrystalline corrosion. Option A. is detectable by x-rays. Option B. is the same as exfoliation corrosion. Option C. always appears as small surface cracks.
Correct Answer is. is detectable by x-rays. Explanation. NIL.
Question Number. 34. Chromate treatment is applied to. Option A. Al alloys. Option B. Fe alloys. Option C. magnesium alloys.
Correct Answer is. magnesium alloys. Explanation. NIL.
Question Number. 16. Intergrannular corrosion in structural aluminium alloy parts. Option A. are not likely to occur in parts fabricated from heat-treated sheet aluminium. Option B. may be detected by the white, powdery deposit formed on the surface of the metal. Option C. cannot always be detected by surface indications.
Correct Answer is. may be detected by the white, powdery deposit formed on the surface of the metal. OR cannot always be detected by surface indications. Explanation. NIL.
Question Number. 31. Spilled mercury on aluminium. Option A. increases susceptibility to hydrogen embrittlement Option B. may cause impaired corrosion resistance if left in prolonged contact. Option C. causes rapid and severe corrosion in prolonged contact.
Correct Answer is. may cause impaired corrosion resistance if left in prolonged contact. OR causes rapid and severe corrosion in prolonged contact. Explanation. BL/4-10 Para.2.
Question Number. 5. Intergranular corrosion. Option A. can be recognized by a grey powder deposit. Option B. may have no visual surface indication. Option C. can be recognized by its flaking and lifting of the material layers.
Correct Answer is. may have no visual surface indication. Explanation. BL/4-1 2.3.2.
Question Number. 20. If it is necessary to remove corrosion from a steel component in-situ, the base of a suitable solution for this purpose is. Option A. chromic acid. Option B. phosphoric acid. Option C. nitric acid.
Correct Answer is. phosphoric acid. Explanation. NIL.
Question Number. 14. What type of corrosion attacks grain boundaries of aluminium alloys which are improperly or inadequately heat treated?. Option A. Stress corrosion. Option B. Intergranular corrosion. Option C. Surface corrosion.
Correct Answer is. Intergranular corrosion. Explanation. NIL.
Question Number. 49. A composite flap panel has corrosion. What NDT method will you use to detect?. Option A. Low voltage x-ray. Option B. Coin tap test. Option C. High voltage x-ray.
Correct Answer is. Low voltage x-ray. Explanation. Leaflet 6-9 Appendix 1 Paragraph 4.
Question Number. 61. Which of these materials is the most anodic?. Option A. Magnesium. Option B. Cadmium. Option C. 7075-T6 aluminium alloy.
Correct Answer is. Magnesium. Explanation. NIL.
Question Number. 43. Alodizing protects alloy metal from corrosion and does what else?. Option A. Makes a good surface for paint to adhere to. Option B. Makes the surface alkaline. Option C. Seals the surface from moisture.
Correct Answer is. Makes a good surface for paint to adhere to. Explanation. NIL.
Question Number. 45. The form of corrosion most likely to cause stress concentration is. Option A. Surface Corrosion. Option B. Fretting Corrosion. Option C. Pitting Corrosion.
Correct Answer is. Pitting Corrosion. Explanation. NIL.
Question Number. 23. What action should be taken on finding intergrannular corrosion?. Option A. Replace complete component part. Option B. De-corrode and reprotect. Option C. Renew corroded area by patching.
Correct Answer is. Replace complete component part. Explanation. NIL.
Question Number. 46. Lead acid battery fluid has been found to be leaking on the surface of the aircraft structure. What substance would you use to neutralise the acid?. Option A. Sulphur and Lime. Option B. Hot distilled water. Option C. Sodium bicarbonate of soda.
Correct Answer is. Sodium bicarbonate of soda. Explanation. CAIP BL/4-1 para 4.1.3.
Question Number. 8. Galvanic action caused by dissimilar metal contact may best be prevented by. Option A. applying a non-porous dielectric material between the surfaces. Option B. Special precautions are not required if they are properly bonded. Option C. priming both the surfaces with a light coat of zinc chromate primer.
Correct Answer is. Special precautions are not required if they are properly bonded. OR applying a non-porous dielectric material between the surfaces. Explanation. Jointing compound is a non-porous dielectric.
Question Number. 62. Which of these materials is the most cathodic?. Option A. 2024 aluminium alloy. Option B. Zinc. Option C. Stainless steel.
Correct Answer is. Stainless steel. Explanation. NIL.
Question Number. 30. What are the signs of fretting corrosion on steel?. Option A. Dark staining around area. Option B. Surface cracking as corrosion breaks through to surface of component. Option C. Rust on surface.
Correct Answer is. Surface cracking as corrosion breaks through to surface of component. OR Dark staining around area. Explanation. Fretting corrosion is caused when there is some relative movement between parts, causing a fine dark powdery paste of corrosion products. BL/4-1 Para.3.1.5.
Question Number. 7. Jointing compound is used for what reason?. Option A. To prevent dissimilar metal corrosion. Option B. To bond the components together. Option C. To make the components easier to disassemble.
Correct Answer is. To prevent dissimilar metal corrosion. Explanation. Jointing compound is used to prevent dissimilar metal contact.
Question Number. 47. What colour is the corrosion found on the surface of aluminium alloys?. Option A. White/Grey. Option B. Green/Blue. Option C. Black.
Correct Answer is. White/Grey. Explanation. NIL.
Question Number. 18. Magnesium alloy components are protected by. Option A. an electro process. Option B. a chemical process. Option C. a painted process.
Correct Answer is. a chemical process. Explanation. NIL.
Question Number. 24. Anodic treatment of aluminium alloy gives. Option A. a purple finish. Option B. a shorter life due to hardening. Option C. a pure coating of aluminium oxide on the surface.
Correct Answer is. a pure coating of aluminium oxide on the surface. Explanation. NIL.
Question Number. 19. Corrosion products should be removed from magnesium alloys by the use of. Option A. a solution of 10% by weight of chromic acid in distilled water with 0.1% by volume of sulphuric acid. Option B. a solution of 10% by volume of chromic acid in distilled water with 1% phosphoric acid. Option C. aluminium wool.
Correct Answer is. a solution of 10% by volume of chromic acid in distilled water with 1% phosphoric acid. OR a solution of 10% by weight of chromic acid in distilled water with 0.1% by volume of sulphuric acid. Explanation. NIL.
Question Number. 58. A non-electrolytic chemical treatment for aluminium alloys to increase corrosion resistance and paint bonding qualities is called. Option A. alodizing. Option B. anodizing. Option C. dichromating.
Correct Answer is. alodizing. Explanation. Alodizing is a (non-electrolytic) deposition of oxide film.
Question Number. 29. Hooks, wires and other suspension devices used in an anodic bath should be made of. Option A. brass or copper. Option B. aluminium or titanium. Option C. steel or copper.
Correct Answer is. aluminium or titanium. Explanation. CAIPs BL/7-1 Para.4. BL/7-1 4.1.
Question Number. 15. The artificial production of a film of oxide on the surface of aluminium or any of its alloys is commonly called. Option A. alodizing. Option B. parco lubrizing. Option C. anodizing.
Correct Answer is. anodizing. Explanation. Anodizing is an artificially produced layer of oxide on the surface of aluminium (or titanium).
Question Number. 11. The electrolytic process that forms an oxide film on the surface of aluminium alloys is known as. Option A. galvanizing. Option B. anodizing. Option C. electroplating.
Correct Answer is. anodizing. Explanation. NIL.
Question Number. 42. The artificial production of a film of oxide on the surface of aluminium or any of its alloys is commonly called. Option A. anodizing. Option B. parco lubrizing. Option C. alodizing.
Correct Answer is. anodizing. Explanation. NIL.
Question Number. 51. In the anodic film inspection and sealing test, if a good seal has been accomplished. Option A. the dye mark will not rub off. Option B. the dye mark has no importance. Option C. the dye mark will rub off.
Correct Answer is. the dye mark will not rub off. Explanation. NIL.
Question Number. 4. When a steel part is welded, corrosion occurs because. Option A. it is affected by spatter. Option B. the strip has become anodic. Option C. paint has been removed.
Correct Answer is. the strip has become anodic. Explanation. BL/4-1 3.1.4.
Question Number. 63. Galvanic corrosion is most likely to be most rapid and severe when. Option A. the surface area of the anodic metal is smaller than the surface area of the cathodic material. Option B. the surface area of the cathodic metal and the anodic material are approximately the same. Option C. the surface area of the cathodic metal is smaller than the surface area of the anodic material.
Correct Answer is. the surface area of the cathodic metal and the anodic material are approximately the same. OR the surface area of the anodic metal is smaller than the surface area of the cathodic material. Explanation. NIL.
Question Number. 53. Corrosion is always completely removed. Option A. to prevent further damage. Option B. to fit new parts. Option C. to permit the extent of damage to be assessed.
Correct Answer is. to permit the extent of damage to be assessed. Explanation. NIL.
Question Number. 26. Fretting corrosion occurs where. Option A. two material are subject to very slight movement between the two. Option B. a deep scratch increases to become fretting corrosion. Option C. pitting corrosion is allowed to become more pronounced.
Correct Answer is. two material are subject to very slight movement between the two. Explanation. Fretting is corrosion combined with small relative movement.
Question Number. 39. To check the interior of tubular members for corrosion attack. Option A. any form of test is acceptable. Option B. ultra sonic testing is necessary. Option C. dye penetrant testing should be used.
Correct Answer is. ultra sonic testing is necessary. Explanation. NIL.
Question Number. 36. Fretting corrosion occurs with. Option A. water trapped between moving parts. Option B. vibration in bolted parts. Option C. improper heat treatment.
Correct Answer is. vibration in bolted parts. Explanation. BL/4-1 3.1.5.
Question Number. 9. After welding, stainless steel is susceptible to a corrosion known as. Option A. weld deterioration. Option B. weld decay. Option C. weld rot.
Correct Answer is. weld decay. Explanation. Corrosion after welding is called 'weld decay'. BL/6-16 4.5.1 & BL/4-1.
