Materials And Processes
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- 1.Which of the following descirbe the effects of annealing steel and aluminum alloys?
- A.
Decrease in internal stress.
- B.
Softening of the metal.
- C.
1 and 2.
- D.
Tempering.
- 2.Which heat-treating process of metal produces a hard wear-resistant surface over a strong, tough core?
- A.
Case hardening.
- B.
Annealing.
- C.
Tempering
- 3.Which heat-treating operation would be performed when the surface of the metal is changed chemically by introducing a high carbide or nitride content?
- A.
Tempering
- B.
Normalizing
- C.
Case hardening
- 4.Normalizing is a process of heat treating
- A.
Aluminum alloys only
- B.
Iron base metals only
- C.
Both aluminum alloys and iron-base metals
- 5.Which of the following occurs when a mechanical force is repeatedly applied to most metals at room temperature, such as rolling, hammering, or bending?
- A.
The metals become artificially aged.
- B.
The metals become stress corrosion cracked.
- C.
The metals become cold worked, strain or work hardened.
- 6.The reheating of a heat treated metal, such as with a welding torch
- A.
Has little or no effect on a metal's heat treated characteristics.
- B.
Can significantly alter a metal's properties in the reheated area.
- C.
Has a cumulative enhancement effect on the original heat treatment.
- 7.Why is steel tempered after being hardened?
- A.
To increase its hardness and ductility.
- B.
To increase its strength and decrease its internal stresses.
- C.
To relieve its internal stresses and reduce its brittleness.
- 8.What aluminum alloy designations indicate that the metal has recieved no hardening or tempering treatment?
- A.
3003-F
- B.
5052-H36
- C.
6061-O
- 9.Which material cannot be heat treated repeatedly without harmful effects?
- A.
Unclad aluminum alloy in sheet form.
- B.
6061-T9 stainless steel.
- C.
Clad aluminum alloy.
- 10.What is descriptive of the annealing process of steel during and after it has been annealed?
- A.
Rapid cooling; high strength
- B.
Slow cooling; low strength
- C.
Slow cooling; increased resistance to wear.
- 11.What is generally used in the construction of aircraft engine firewalls?
- A.
Stainless Steel.
- B.
Chrome-molybdenum alloy steel.
- C.
Titanium Nickel alloy.
- 12.Alclad is a metal consisting of
- A.
Aluminum alloy surface layers and a pure aluminum core.
- B.
Pure aluminum surface layers on an aluminum alloy core.
- C.
A homogeneous mixture of pure aluminum and aluminum alloy.
- 13.The SAE and the American Iron and Steel Institute use a numerical index system to identify the compostion of various steels. In the number "4130", designating Chromium Molybdenum steel, the first digit indicates the
- A.
Percentage of the basic element in the alloy.
- B.
Percentage of carbon in the alloy in hundredths of a percent.
- C.
Basic alloying element
- 14.The core material of Alclad 2024-T4 is
- A.
Heat-treated aluminum alloy, and the surface material is commercially pure aluminum.
- B.
Commercially pure aluminum, and the surface material is heat-treated aluminum alloy.
- C.
Strain-hardened aluminum alloy, and the surface material is commercially pure aluminum.
- 15.The aluminum code number 1100 identifies what type of aluminum?
- A.
Aluminum alloy containing 11 perfect copper.
- B.
Aluminum alloy containing zinc.
- C.
99 percent commercially pure aluminum.
- 16.In the four-digit aluminum index system number 2024, the first digit indicates
- A.
The major alloying element.
- B.
The number of different major alloying elements used in the metal.
- C.
The percent of alloying metal added.
- 17.Why is it considered good practice to normalize a part after welding?
- A.
To relieve internal stresses developed within the base metal.
- B.
To increase the hardness of the weld.
- C.
To remve the surface scale formed during welding.
- 18.Parts are rinsed thoroughly in hot water after they have been heat treated in a sodium and potassium nitrite bath to
- A.
Prevent corrosion.
- B.
Prevent surface cracking.
- C.
Retard discoloration.
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