1. The property of a metal to resist deformation when subjected to a tensile load and is proportional to the maximum stress required to cause fracture:
c. Tensile strength.
2. The ability of a metal to resist wear and penetration is defined as:
c. Bearing strength.
3. What is the strain of a 1.2m tube which as extended 15mm?
4. The graph to the right is an example of what type of material?
a. Ferrous metal.
b. Non-ferrous metals.
5. The Vickers test uses:
a. Small steel ball bearing.
b. A conical shaped, diamond tipped indenter.
c. A square based, diamond tipped indenter.
6. Creep occurs at temperatures:
a. At or above 0.4T where T = melting point in Kelvin.
b. At or above 0.5T where T = boiling point in Kelvin.
c. At or above 0.4T where T = melting point in Celsius.
7. Creep is:
a. A phenomenon occurring in metals only.
b. Due to the cracks appearing inside grains.
c. Due to the microscopic flow along grain boundaries.
8. Which of the following is not an essential requirement for fatigue development?
a. Applied stress fluctuation of sufficient magnitude.
b. Elevated temperatures.
c. Sufficient number of cycles.
9. The appearance of striations on a metal indicates:
a. Differences in loads.
b. Load reversals.
c. Residual stresses.
10. When pig iron is placed in a Bessemer converter:
a. 10 – 20 tonnes for 30 minutes.
b. 20 – 30 tonnes for 45 minutes.
c. 20 – 50 tonnes for 15 minutes.
11. A ferrous metal has the code 4089; what does this denote about the material?
a. Chromium vanadium alloy of 99.89% iron purity.
b. Molybdenum alloy of 0.89% carbon content.
c. Nickel steel of 0.89% carbon content.
12. At room temperature, ferrite contains around _________% of carbon.
a. 0.85% carbon.
b. 0.006% carbon.
c. 0.3% carbon.
13. Cementite / iron carbide consists of:
a. 1 carbon atom to 5 iron atoms.
b. 1 iron atom to 3 carbon atoms.
c. 1 carbon atom to 3 iron atoms.
14. What is produced when carbon steel is heated just above the UCP?
15. Maximum tensile strength of hardened carbon steel is achieved at:
a. 0.30% carbon content.
b. 0.69% carbon content.
c. 0.83% carbon content.
16. The rate of penetration in carburising is:
a. 5mm every hour.
b. 1mm every 2-3 hours.
c. 1mm every 5-6 hours.
17. The carbon rich medium in liquid carburising is:
c. Sodium Cyanide.
18. Nitralloy steels usually contain:
a. 1.5% Al; 1% Cr; 0.2% Mo.
b. 1% Al; 1.5% Cr; 0.2% Mo.
c. 0.2% Al; 1% Cr; 1.5% Mo.
19. When calculating the proof stress, 0.1% or 0.2% of what is used?
a. Average load.
b. Ultimate tensile strength.
c. Gauge length.
20. The impact test is a measure of materials:
21. The Rockwell B test uses:
a. Small steel ball bearing.
b. Conical shape, diamond tip.
c. Square based pyramid, with a diamond tip.
22. Which element when alloyed with steel causes it to become brittle?
23. Magnesium fires will be extinguished using:
b. Powder extinguisher.
24. The name given to a steel alloy with 68% nickel and 29% copper is:
25. Nickel steel alloys of 50% to 80% composition nickel are given the name:
26. What is the name of the salt used in the salt bath of aluminium heat treatment?
a. Caustic soda.
b. Sodium cyanide.
c. Nitrate of soda.
27. The lag time for aluminium heat treated alloys is:
a. 10 seconds.
b. 30 seconds.
c. 10 minutes.
28. Alclad materials can be heat treated:
a. A maximum of five times....