EASA Part 66 : Material Question3

Question Number. 35. The time between removal from heat treatment furnace and quenching must be not more than. Option A. 3 seconds. Option B. 10 seconds. Option C. 7 seconds.

Correct Answer is. 10 seconds. Explanation. Jeppesen A&P Technician Airframe Textbook Page 2-9.

Question Number. 33. Solution treatment after manufacturers have performed it once can be carried out a further. Option A. 1 time. Option B. 2 times. Option C. 3 times.

Correct Answer is. 2 times. Explanation. Solution treatment to Alclad can be carried out only 3 times in total. CAIPs BL/9-1. Rivets can be re-heat treated 3 times (so 4 times in total) BL/6-27 6.3.

Question Number. 30. Which part of the 2017-T36 aluminium alloy designation indicates the primary alloying agent used in its manufacture?. Option A. 20. Option B. 2. Option C. 17.

Correct Answer is. 2. Explanation. NIL.

Question Number. 15. A material has the code 2024-TH6 on it. Which part of the code indicates the percentage of the alloying element?. Option A. H. Option B. 20. Option C. 6.

Correct Answer is. 20. Explanation. NIL.

Question Number. 2. How many times can clad alloy be heat treated?. Option A. Once only. Option B. 3 times. Option C. as many times as required.

Correct Answer is. 3 times. Explanation. NIL.

Question Number. 25. Clad aluminium alloy (alclad) has a pure aluminium coating of. Option A. 0.002. Option B. 1% of alloy thickness. Option C. 5% of alloy thickness.

Correct Answer is. 5% of alloy thickness. Explanation. The cladding is 5% each side.

Question Number. 16. Aluminium alloyed primarily with magnesium is numbered. Option A. 2025. Option B. 5025. Option C. 1025.

Correct Answer is. 5025. Explanation. NIL.

Question Number. 61. Monel metal consists of approximately. Option A. 66% Chromium and 33% Copper. Option B. 66% Copper and 33% Nickel. Option C. 66% Nickel and 33% Copper.

Correct Answer is. 66% Chromium and 33% Copper. Explanation. NIL. http://www.lenntech.com/Monel.htm

Question Number. 1. The most suitable mixture for a salt bath operation is. Option A. 20% nitrate of soda and 80% sodium nitrate. Option B. 90% nitrate of soda and 10% sodium nitrate. Option C. 70% sodium chlorate and 30% sodium nitrate.

Correct Answer is. 90% nitrate of soda and 10% sodium nitrate. Explanation. BL/9-1 12.

Question Number. 59. A metal is coded 1285 using the IADS coding method. This means the metal is. Option A. 85% pure aluminium. Option B. 99.85% pure aluminium. Option C. a copper based aluminium alloy i.e. duralumin.

Correct Answer is. 99.85% pure aluminium. Explanation. NIL. http://www.jjjtrain.com/vms/engineering_metal_stds.html

Question Number. 19. Which of the following metals is an aluminium silicon alloy used mainly for casting?. Option A. Alclad. Option B. Aldrey. Option C. Alpax.

Correct Answer is. Alpax. Explanation. Trade name for material used mainly for castings. Low density and corrosion resistance. 87 % Aluminium 13 % Silicon. http://www.glue-it.com/model-engineering/general-information/glossary/a_summ.htm

Question Number. 11. If caustic soda turns a material black what is it?. Option A. Aluminium alloy. Option B. Alclad. Option C. Aluminium.

Correct Answer is. Aluminium alloy. Explanation. Caustic soda turns al.alloy black, and pure aluminium white.

Question Number. 12. What chemical is used to identify aluminium alloys?. Option A. Caustic soda. Option B. Copper sulphate. Option C. Nitric acid.

Correct Answer is. Caustic soda. Explanation. Caustic soda turns al.alloy black, and pure aluminium white.

Question Number. 54. The common bonding material for Tungsten Carbide is. Option A. Invar. Option B. Cobalt. Option C. Silicon.

Correct Answer is. Cobalt. Explanation. Cobalt is used to bond tungsten carbide to cutting tools.

Question Number. 62. Silver solder is composed of the materials. Option A. Copper, Tin and Silver. Option B. Zinc, Lead and Silver. Option C. Copper, Zinc and Silver.

Correct Answer is. Copper, Zinc and Silver. Explanation. NIL. http://ajh-knives.com/soldering.html

Question Number. 28. Why is nickel chromium used in many exhaust systems?. Option A. Corrosion resistant and high heat conductivity. Option B. Lightweight and flexible. Option C. Corrosion resistant and low expansion coefficient.

Correct Answer is. Corrosion resistant and low expansion coefficient. Explanation. Nickel and chromium are the alloying elements in Stainless Steel.

Question Number. 64. What is fatigue?. Option A. Cyclic stressing of a part. Option B. Failure of a component due to corrosion. Option C. Constant stressing of a part.

Correct Answer is. Cyclic stressing of a part. Explanation. NIL.

Question Number. 7. What care should you take with 2024-T3?. Option A. Do not scratch or make nicks in it. Option B. Do not bend at sharp angles. Option C. Do not remove the surface of the sheet metal.

Correct Answer is. Do not scratch or make nicks in it. Explanation. 2024-T3 has a low fatigue resistance.

Question Number. 47. What is generally true for titanium alloy?. Option A. It is stronger than the aluminium. Option B. It is stronger than the steel. Option C. It has lower density than magnesium.

Correct Answer is. It is stronger than the aluminium. Explanation. NIL. http://www.geocities.com/pganio/materials.html

Question Number. 5. What is the effect of precipitation heat treatment on aluminium?. Option A. It speeds up age hardening process. Option B. It delays the age hardening process. Option C. It softens the material to allow it to be worked.

Correct Answer is. It speeds up age hardening process. Explanation. NIL.

Question Number. 55. Grain size will effect the mechanical properties of metal. Which of the following is true?. Option A. Large grain size is attributed to slow cooling rates and will give less tensile strength. Option B. Materials with large grain size are more prone to creep. Option C. Small grain size is normally attributed to rapid cooling rates and will give less tensile strength.

Correct Answer is. Large grain size is attributed to slow cooling rates and will give less tensile strength. Explanation. NIL.

Question Number. 4. For a particular metal material, what conditions are best to minimise creep?. Option A. Low stress, low temperature. Option B. Low stress, high temperature. Option C. High stress, low temperature.

Correct Answer is. Low stress, low temperature. Explanation. NIL.

Question Number. 10. Anodizing protects alloy metal from corrosion and does what else?. Option A. Seals the surface from moisture. Option B. Makes a good surface for paint to adhere to. Option C. Makes the surface alkaline.

Correct Answer is. Makes a good surface for paint to adhere to. Explanation. NIL.

Question Number. 60. A material containing approximately 66% nickel and 33% copper is known as. Option A. Nimonic. Option B. Monel metal. Option C. Invar

Correct Answer is. Monel metal. Explanation. NIL.

Question Number. 36. When buffing surface of Aluminium Alloy, what material are you removing?. Option A. Oxide layer. Option B. Aluminium. Option C. Alloy.

Correct Answer is. Oxide layer. Explanation. Polishing al.alloy, pure al. or Alclad, you would be removing the oxide layer.

Question Number. 22. In a sheet metal store the following is marked on a sheet of aluminium alloy: L162 (sheet 1). , On a different sheet the following marking is found: L172 (sheet 2). The following is true: Option A. Sheet one has a shinier surface than sheet 2. Option B. Sheet one is more ductile than sheet 2. Option C. Sheet two is of a thicker gauge than sheet 1.

Correct Answer is. Sheet one is more ductile than sheet 2. Explanation. The L numbers are the British al. alloy specs.

Question Number. 38. Why are aluminium alloys used on aircraft, instead of pure aluminium?. Option A. Stronger. Option B. Corrosion resistant. Option C. Lighter.

Correct Answer is. Stronger. Explanation. NIL.

Question Number. 65. Why is stop drilling carried out at the end of a crack?. Option A. To change the direction of the crack. Option B. To stop the crack from propagating. Option C. To increase the stress concentration at the crack end.

Correct Answer is. To stop the crack from propagating. Explanation. NIL.

Question Number. 37. Why is clad alloy preferred to pure Aluminium?. Option A. Less brittle. Option B. More ductile. Option C. Tougher.

Correct Answer is. Tougher. Explanation. The important factor is that clad aluminium alloy is 90% aluminium alloy. The fact that it is clad is irrelevant.

Question Number. 44. Titanium can be identified by placing it on a grinding wheel and looking for. Option A. Red Sparks. Option B. Yellow Sparks. Option C. White Sparks.

Correct Answer is. White Sparks. Explanation. NIL.

Question Number. 21. The British system of heat treatment codes is. Option A. a series of letters. Option B. numbers and letters. Option C. a series of numbers.

Correct Answer is. a series of letters. Explanation. CAIP BL/9-1.

Question Number. 34. Following solution treatment aluminium alloy can be placed into service. Option A. after 5 days. Option B. straight away. Option C. after 24 hours.

Correct Answer is. after 5 days. Explanation. Full hardness is achieved after 4-5 days. CAIPs BL/9-1 Para 7.

Question Number. 46. Re-treatment of aluminium alloys can be performed by. Option A. alocrom treatment. Option B. brushing on phosphate treatment followed by paint. Option C. selenious acid treatment.

Correct Answer is. alocrom treatment. Explanation. NIL.

Question Number. 52. When two or more metallic materials are fused together, the combination is known as. Option A. a composite material. Option B. a thermosetting compound. Option C. an alloy.

Correct Answer is. an alloy. Explanation. Fuse means 'to melt'.

Question Number. 31. Clad aluminium alloys are used in aircraft because they. Option A. are harder wearing than unclad aluminium alloys. Option B. are less subject to corrosion than uncoated aluminium alloys. Option C. are stronger than unclad aluminium alloys.

Correct Answer is. are less subject to corrosion than uncoated aluminium alloys. Explanation. NIL.

Question Number. 9. If aluminium alloy is not quenched within the minimum time allowed after heat treatment is it will be. Option A. subject to corrosion. Option B. malleable. Option C. brittle.

Correct Answer is. brittle. Explanation. If al. alloy is not quenched, the copper precipitates and it remains hard and brittle.

Question Number. 18. Non heat treatable materials. Option A. cannot be hardened. Option B. can be hardened by strain hardening or cold working. Option C. can be hardened by annealing.

Correct Answer is. can be hardened by strain hardening or cold working. Explanation. All materials but a few (eg lead) can be hardened by cold working.

Question Number. 32. Non heat treatable aluminium alloys. Option A. can be hardened by strain hardening. Option B. cannot be softened. Option C. cannot be hardened.

Correct Answer is. can be hardened by strain hardening. Explanation. NIL.

Question Number. 43. The process of forming a pure layer of aluminium over an aluminium alloy is. Option A. metalizing. Option B. cladding. Option C. electroplating.

Correct Answer is. cladding. Explanation. NIL.

Question Number. 41. Alclad is. Option A. aluminium with duralumin cladding. Option B. duralumin with aluminium coating. Option C. duralumin with magnesium cladding.

Correct Answer is. duralumin with aluminium coating. Explanation. NIL.

Question Number. 53. Malleable materials are normally. Option A. also highly ductile. Option B. easy to cast. Option C. easily forged.

Correct Answer is. easily forged. Explanation. NIL.

Question Number. 48. Malleable materials are. Option A. easy to forge. Option B. easy to cast. Option C. highly ductile.

Correct Answer is. easy to forge. Explanation. Malleability does not necessarily mean ductility.

Question Number. 56. The cracking of structural members under repeated stress lower than the ultimate tensile load is known as. Option A. creep. Option B. fatigue failure. Option C. stress reversal.

Correct Answer is. fatigue failure. Explanation. NIL.

Question Number. 14. Precipitation treating makes the metal. Option A. Precipitation treating makes the metal. Option B. less strong and hard. Option C. harder, stronger and less ductile.

Correct Answer is. harder, stronger and less ductile. Explanation. NIL.

Question Number. 29. Titanium alloys. Option A. are cheap to manufacture. Option B. have a high strength to weight ratio. Option C. are corrosion resistant but heavy.

Correct Answer is. have a high strength to weight ratio. Explanation. NIL.

Question Number. 27. A tube complying to BS T51 is. Option A. tungum. Option B. HTS tube. Option C. high pressure seamless copper tube.

Correct Answer is. high pressure seamless copper tube. Explanation. BL/6-15 3.2.1 or download External document... page 28. http://www.dstan.mod.uk/data/05/069/00000300.pdf

Question Number. 13. Pure aluminium is. Option A. highly resistant to corrosion. Option B. not resistant to corrosion. Option C. reasonably resistant to corrosion.

Correct Answer is. highly resistant to corrosion. Explanation. Pure aluminium is highly resistant to corrosion.

Question Number. 3. The symbol 'W' on a material indicates. Option A. it is for use on aircraft mainplanes only. Option B. it has been solution treated and will respond effectively to precipitation treatment. Option C. it is for workshop use only.

Correct Answer is. it has been solution treated and will respond effectively to precipitation treatment. Explanation. NIL.

Question Number. 17. Heat treatment is shown on a British aluminium alloy by a. Option A. letter and number code. Option B. number code. Option C. letter code

Correct Answer is. letter code Explanation. BL/9-1 16.2.

Question Number. 50. The metal which must not be heated in a salt bath is. Option A. magnesium alloy. Option B. duralumin. Option C. rivets made of alclad.

Correct Answer is. magnesium alloy. Explanation. NIL.

Question Number. 49. If a material has to undergo deep cold forming operation. The essential property would be. Option A. ductility. Option B. malleability. Option C. elasticity.

Correct Answer is. malleability. Explanation. NIL.

Question Number. 63. The ease with which a material can be forged, rolled and extruded without fracture is an indication of a material's. Option A. malleability. Option B. ductility. Option C. brittleness.

Correct Answer is. malleability. Explanation. NIL.

Question Number. 40. Age hardening of aluminium is. Option A. never carried out. Option B. a gradual hardening over a period of time. Option C. not necessary.

Correct Answer is. never carried out. Explanation. Aluminium will not age harden like aluminium alloys such as dural as there ars no alloying elements such as copper that will come out of solution over time.

Question Number. 26. The main metal in monel is. Option A. aluminium. Option B. nickel. Option C. stainless steel.

Correct Answer is. nickel. Explanation. Monel is a nickel alloy.

Question Number. 42. The oxide film on the surface of aluminium is. Option A. hard and porous. Option B. porous. Option C. non porous.

Correct Answer is. non porous. Explanation. NIL.

Question Number. 24. Sheet metal should be stored. Option A. above 25 degrees centigrade. Option B. on its edge in racks to prevent scratching. Option C. stacked flat to prevent bending of sheets.

Correct Answer is. on its edge in racks to prevent scratching. Explanation. CAAIPs Leaflet 1-8.

Question Number. 6. Aluminium exposed to air will. Option A. oxidise and become weaker. Option B. oxidise and become electrically insulated. Option C. oxidise and become stronger.

Correct Answer is. oxidise and become electrically insulated. Explanation. Oxides of all metals are insulators.

Question Number. 20. Aircraft skin is joggled to. Option A. provide smooth airflow at faying surfaces. Option B. make a frame lighter but stronger. Option C. conform to the aircraft contour.

Correct Answer is. provide smooth airflow at faying surfaces. Explanation. A joggle makes a flush surface at a join.

Question Number. 66. Annealing of aluminium. Option A. increases the tensile strength. Option B. makes the material brittle. Option C. removes stresses caused by forming.

Correct Answer is. removes stresses caused by forming. Explanation. NIL.

Question Number. 58. A sheet of metal is designated 2024-T4. The code tells us that the material is a copper based aluminium alloy. Option A. annealed and Naturally aged. Option B. solution treated and naturally aged. Option C. solution treated and artificially aged.

Correct Answer is. solution treated and naturally aged. Explanation. NIL. http://www.jjjtrain.com/vms/engineering_metal_stds.html

Question Number. 57. A piece of duralumin has been annealed and bent into shape prior to fitting to an aircraft. Which of the following is correct? It must be. Option A. fitted to the aircraft within 24 hours. Option B. solution treated, precipitation treated and fitted to the aircraft within 2 hours. Option C. solution treated prior to fitting to an aircraft.

Correct Answer is. solution treated, precipitation treated and fitted to the aircraft within 2 hours. OR solution treated prior to fitting to an aircraft. Explanation. NIL.

Question Number. 45. The critical process of heat treatment is. Option A. temperature, method of heating and cooling. Option B. temperature and method of heating only. Option C. method of heating only.

Correct Answer is. temperature, method of heating and cooling. Explanation. NIL.

Question Number. 51. The colour code on sheet metal indicates. Option A. only the specification of the material. Option B. the spec and gauge of the material. Option C. that the material is from an approved source.

Correct Answer is. that the material is from an approved source. OR only the specification of the material. Explanation. NIL.

Question Number. 8. Composition of silver solder is. Option A. tin and lead. Option B. tin, lead and silver. Option C. tin, lead, silver and antimony.

Correct Answer is. tin, lead, silver and antimony. Explanation. BL/6-1 Table 3.

Question Number. 23. Cold working of a material is used to reduce. Option A. material hardness. Option B. fatigue. Option C. wear of manufacturing tools.

Correct Answer is. wear of manufacturing tools. Explanation. Cold working increases strength and hardness (therefore reduces wear).

Question Number. 39. The magnesium alloys used in aircraft can be recognized by. Option A. shiny surface due to chromium plated on the surface. Option B. yellowish surface due to protective treatment. Option C. silver surface due to protective coating.

Correct Answer is. yellowish surface due to protective treatment. Explanation. NIL.