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- 1. Multiple Choice
Based on the ANSI standards H35.1 and H35.2 there are two classes of aluminium alloys..
Copper based
Hard and soft
Wrought and cast
pure and not pure.
- 2. Multiple Choice
In the American National Standards Institute (ANSI)Wrought aluminium designation system, 2xxx-9xxx series. What does the first digit indicate?
The Minimum aluminium content is 99%
The Alloy modification
The Minimum aluminium percentage above 99%
The major alloying element.
- 3. Multiple Choice
In the alloy designation system , what is the major alloying element 5 series represent?
copper
zink
Magnesium and Silicon
Magnesium.
- 4. Multiple Choice
4xxx series aluminum is alloyed with silicon.what are it`s advantages?
Lowers the metals melting point making it suitable for welding and brazing.
Produces greater strength.
Produces moderate strength and good working characteristics.
work hardened by straining.
- 5. Multiple Choice
In the 1xxx series of wrought aluminium alloys, 3rd and 4th digits indicate?
Minimum aluminum content is above 99% with no major alloying element.
Modifications in impurity limits
Minimum aluminium percentage above 99%
- 6. Multiple Choice
Aluminium alloys 2017 and 2024 are the most common aluminum alloys used on aircraft. What series are they?
5xxx
8xxx
2xxx
3xxx
- 7. Multiple Choice
7075 and 7178 are are hard and strong but are difficult to bend. What is the major alloying element
Copper
Manganese and Silicon
Manganese
Zinc
- 8. Multiple Choice
Heat treatable aluminium alloy 2024 has copper as the major alloying element. what percentage of copper is alloyed?
1.8%
2.5%
4%
4.5%
- 9. Multiple Choice
There are two types of heat treatments for Heat treatable aluminum alloys, One is solution Heat treatment. What is it?
A Natural ageing process
Artificial ageing process
Heating the aluminum alloy to mix with the alloying element.
Softening the metal to decrease stress.
- 10. Multiple Choice
There are two types of heat treatment for heat treatable aluminum alloys. One is Precipitation heat treatment,what is it?
Heating the Aluminium alloy to mix with alloying element.
Softening the metal to relieve stress.
Reheating and soaking the metal to speed up the age hardening process,
Heated and pressure applied to cure the material.
- 11. Multiple Choice
How many times can clad materials be heat treated? No more than..
Once only
Twice
Four times
Three times
- 12. Multiple Choice
Heat treatable alloys have their hardness conditioned by -T followed by numbers. What would -T6 indicate?
Artificially aged then cold worked.
Solution Heat. treated
Solution heat treated and stabilized.
Solution heat treated followed by artificial ageing.
- 13. Multiple Choice
Annealing is the opposite of hardening, it softens the metal and decreases internal stress. How is it done?
cold worked or strain hardened
Alloy raised to correct temperature,soaked and cooled to 500 deg F at 50 deg F per hour.
Heated considerably below it`s critical temperature and soaked.
Heated above it`s critical temperature and rapidly cooled.
- 14. Multiple Choice
Heat treatable and non heat treatable Alloys can be hardened by cold working or work hardening. This is indicated by a dash then a letter and number. What does -H2 mean?
Strain hardened
Fabricated
Strain hardened and partly annealed
strain hardened and stabilized
- 15. Multiple Choice
A Nickel alloy is Monel, what percentage of Nickel is in Monel?
29%
45%
68%
80%
- 16. Multiple Choice
Titanium is classified as alpha, alpha-beta and beta. What are the characteristics of Alpha-beta Titanium?
Medium to high strength, not weldable but good forming characteristics.
Heat treated to very high strength excellent forming characteristics.
Medium strength 120-150 KSI can be welded and forged.
low strength but very easily formed and welded.
- 17. Multiple Choice
The American Society for Testing Materials (ASTM) has a classification for Magnesium Alloys. What would the letter K stand for in this system?
Thorium
Zirconium
Aluminium
Rare Earth
- 18. Multiple Choice
Where would you find inonel parts on an aircraft?
Undercarriage castings
Fuselage frames and stringers.
Engine nozzle supports,fan casings and blades,
bearings of flying controls.
- 19. Multiple Choice
Bronze is a copper alloyed with tin. Where on an aircraft would you find Bronze.
Wheel bearings
Wing ribs and formers.
Bushings, Bearings,fuel metering valves.
diaphragms,ball cages and spring washers.
- 20. Multiple Choice
Clad aluminium is aluminium with a thin coat of pure aluminium to protect against corrosion. What is Anodizing to do with this?
A mechanically applied protective coating.
A surface finish like varnish.
An electrochemically applied oxide coating.
An alkaline solution applied to prevent corrosion.
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