Engineering Materials Quiz! Trivia Questions Test

1. Fretting corrosion is most likely to occur

When two surfaces fit tightly together but can move relative to one another

Only when two dissimilar metals are in contact

When two surfaces fit loosely together and can move relative to one another

2. Titanium is used in the Aerospace industry because of its?

Excellent strength at high temperature

Excellent hardness at high temperature

Excellent weldability at high temperature

3. Alloys that are described as "refractories" will:

Maintain their mechanical properties at very high temperatures

Lose their mechanical properties at very high temperatures

Maintain their mechanical properties at very low temperatures

4. A "step" curing process is carried out:

Automatically by a programmed controller

By installing the repair in a vacuum bag

Manually by an operator

5. The reheating of a heat-treated metal, such as with a welding torch.

Has little or no effect on a metal's heat treated characteristics

Has a cumulative enhancement effect on the original heat treatment

Can significantly alter a metal's properties in the reheated

6. An accelerator is mixed with the:

Catalyst first before mixing it into the resin

Resin before adding the catalyst

Resin after the catalyst has been mixed into it

7. A problem experienced when drilling aramids is that the:

Ends of the fibres "fuzz" the edges of the hole

Hole tends to be oversized

Drill quickly overheats and blunts

8. Quantum mechanics does NOT use which of the following to study atoms.

Probability theories

Energy levels

Shell strengths

9. Why is it necessary to use flux in all silver soldering operations?

To chemically clean the base metal of oxide film

To prevent overheating of the base metal

To increase heat conductivity

10. Filiform corrosion around fasteners is recognised by:

Delamination of the surface layers.

Crevices forming around the fasteners

"worm-like" tracks under the paint

11. The aluminum alloys used in aircraft construction are usually hardened by which method?

Cold working

Aging

Heat treatment

12. A "step" curing process is carried out:

Automatically by a programmed controller

By installing the repair in a vacuum bag

Manually by an operator

13. The temperatures and times to be used for the heat treatment of metals are:

Contained in heat treatment tables issued by the standards authority.

Contained in the material specification sheet

Marked on the material as a temper code

14. Which of the following is NOT a result of increasing carbon in steel?

Decreased weldability

Increase machinability

Increased tensile strength

15. Two molecules having the same composition but different configurations are called?

Polymers

Multimers

Isomers

16. A property of "Invar" steel is that it:

Has an extremely low coefficient of expansion.

Has very high permeability.

Self-hardens under mechanical pressure

17. Which of the following iron ores contains the most percentage of iron?

Magnetite.

Hermatite.

Taconite.

18. Which of the following describes the creep condition?

Slow breakdown of plastic material subjected to repeated normal loads over extended period

Slow stretching of a plastic material subjected to a tensile load over time

Rapid breakdown of a plastic material subjected to repeated normal loads over extended period

19. Which of these converters will still contain many impurities after the steel is produced?

Bessemer converter

Electric arc furnace

Oxygen lance converter

20. One of the advantages of inspecting an aluminum propeller utilising dye-penetrant inspection procedure is that:

Defects just below the surface are indicated

It shows whether visible lines and other marks are actually cracks rather than scratches

It indicates overspeed condition

21. Oxidation in welds will NOT cause which of the following condition?

Difficulty in fusion

Inclusion in joints

Increase in ductility

22. According to SAE and AISI, what is the percentage of carbon in 8620 steel?

0.8%

0.6%

0.2%

23. If the thickness of a beam is trebled its stiffness increases by a factor of:

3

6

9

24. What is the major alloying element in the copper alloy called brass?

Phosphorus

Tin

Zinc

25. Which of the following is NOT a type of bonding between atoms?

Ionic bond

Lattice bond

Van der Waals forces

26. Which of the following additive is added to a coating to control the gloss and adjust the viscosity?

Antiskin

Extender

Catalyst

27. A pictorial representation of critical heat-treating temperatures is called a?

Cycle diagram

Alloy absorption diagram

Phase diagram

28. Sodium chloride is an example of which type of bonding?

Ionic bonding

Covalent bonding

Metallic bonding

29. Which of the following method can produce 99.9% pure copper?

Smelting

Flotation

Electroplating

30. The catalyst used for curing polyester resins is:

Styrene based

Peroxide based

Epoxy based

31. When annealing a 2XXX series aluminum alloy, it should be cooled:

Rapidly by quenching in cold water.

In air or by quenching

At a slow controlled rate.

32. Which of these materials is the most cathodic?

Zinc

2024 aluminum alloy

Stainless steel

33. The type of corrosion mainly affecting extruded aluminium alloy components is:

Crevice corrosion

Filiform corrosion

Exfoliation corrosion

34. Which of the following is NOT true of the alloying of Aluminum?

Copper for machinability

Carbon for weldability

Silicon for casting

35. Alcad is a metal consisting of

Aluminum alloy surface layers and a pure aluminum core

Pure aluminum surface layers on an aluminum alloy core

A homogenous mixture of pure aluminum and aluminum alloy

36. Tungsten and chromium will harden carbon steel by:

Dissolving in ferrite and creating a fine grain structure

Distorting the grain structure

Reacting with carbon and forming carbide

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

Residual

Inductance

Continuous

38. Microbiological growths in a fuel tank primarily cause:

Inter-granular corrosion in the tank floor

Exfoliation corrosion on the tank floor.

Shielding corrosion on the tank floor