Chapitre 18 : Material Steel and Steel Components

35. Fire-protection of structural steel framing members is mandated by building codes for all buildings. a. True b. False

B.false

2. Which of the following ferrous metals is least corrosion resistant? a. Steel c. Cast iron b. Wrought iron

a. Steel

12. W-shape, S-shape, HP-shape, and M-shape are all structural steel I-sections. a. True b. False

a. True

5. An electric arc furnace uses a. two electrodes to melt iron ore. b. two electrodes to melt steel scrap. c. three electrodes to melt iron ore. d. three electrodes to melt steel scrap. e. none of the above.

b. two electrodes to melt steel scrap.

1. Which of the following ferrous metals has the largest amount of carbon? a. Steel c. Cast iron b. Wrought iron

c. Cast iron

16. In a steel angle, both legs must have the same thickness but may be of different lengths. a. True b. False

a. True

23. Diagonal bridging may be used as an alternative to horizontal bridging to stabilize steel joists. a. True b. False

a. True

9. Steel decks are made from cold-formed steel. a. True b. False

a. True

6. Slag is a. a waste product generated from the manufacture of steel. b. the ore used for making steel. c. the ore used for making aluminum. d. a ferrous metal that has been replaced by steel. e. none of the above.

a. a waste product generated from the manufacture of steel.

18. HSS members are made by a. bending and welding heated steel plates. b. cold rolling of steel blooms. c. hot rolling of steel blooms. d. casting molten steel to shape. e. any one of the above, depending on the manufacturer.

a. bending and welding heated steel plates.

11. A W-shape section is so called because a. it is an I-section with wide flanges. b. it is an I-section with a wide web. c. its cross-sectional shape resembles the letter W. d. it is a rectangular section whose width is larger than its depth.

a. it is an I-section with wide flanges

33. Spray-on fire protection materials for steel contain a. portland cement with mineral fibers or lightweight aggregate. b. polymer-based cement with mineral fibers or lightweight aggregate. c. portland cement with normal-weight aggregate. d. polymer-based cement with normal-weight aggregate. e. any one of the above, depending on the manufacturer.

a. portland cement with mineral fibers or lightweight aggregate.

24. Steel joists and joist girders are best utilized in a building that has concentrated loads. a. True b. False

b. False

25. Steel roof decks are either form decks or composite decks. a. True b. False

b. False

29. Roof decks are anchored to supporting members by continuous welds along the support lines. a. True b. False

b. False

34. Spray-on fire protection of steel gives a much cleaner appearance than gypsum board encasement of steel. a. True b. False

b. False

4. The mini-mill method of steel manufacturing predates the integrated-mill method. a. True b. False

b. False

19. Which of the following does not represent a steel joist series? a. H-series c. K-series e. DLH-series b. J-series d. LH-series d. LH-series

b. J-series

15. To obtain the structural engineering properties of standard steel sections, the following publication is generally used. a. Steel Fabricators' Manual b. Steel Construction Manual c. ASTM standard on steel sections d. Local manufacturers' literature e. Steel Erectors' Manua

b. Steel Construction Manual

20. In the steel joist designation 24LH10, the number 24 gives the a. length of the joist in feet. b. depth of the joist in inches. c. weight of the joist in pounds per foot. d. number of web members. e. none of the above.

b. depth of the joist in inches.

30. A pour stop is generally used with a. roof decks. b. floor decks. d. none of the above. c. (a) and (b).

b. floor decks.

31. Two dissimilar metals are generally separated from each other by a separator, which helps to prevent a. atmospheric corrosion. b. galvanic corrosion.

b. galvanic corrosion.

3. An integrated mill produces steel using a. steel scrap. b. iron ore. c. 25% to 50% iron ore plus 25% to 50% scrap. d. none of the above.

b. iron ore.

27. The thickness of sheet steel in a roof or floor deck is generally specified in terms of a. inches. c. gauge number. b. millimeters. d. any one of the above.

c. gauge number

10. The steel type most commonly used for framing members (columns and beams) of a steel building is a. steel type A36 with a yield strength of 36 ksi. b. steel type A36 with a yield strength of 360 ksi. c. steel type A992 with a yield strength of 50 ksi. d. steel type A992 with a yield strength of 40 ksi. e. none of the above.

c. steel type A992 with a yield strength of 50 ksi.

22. Steel joists are braced against instability by a. horizontal bridging members at the bottom of the joists. b. horizontal bridging members at the top of the joists. c. (a) or (b). d. (a) and (b). e. none of the above.

d. (a) and (b).

8. Which of the following statements is true? a. All structural steel sections are made from billets or blooms that are rolled to shape at room temperature. b. All structural steel sections are made by preheating steel sheets and bending them to the required cross sections. c. All structural steel sections are made by bending steel sheets to the required cross sections at room temperature. d. All structural steel sections are made by preheating billets or blooms and rolling them to shape. e. none of the above.

d. All structural steel sections are made by preheating billets or blooms and rolling them to shape.

13. Which of the following steel shapes is most commonly used for the structural frame of buildings? a. HP-shape c. M-shape e. C-shape b. S-shape d. W-shape

d. W-shap

28. Which of the following decks requires structural concrete topping? a. Form deck b. Composite deck c. Floor deck d. all of the above e. none of the above

d. all of the above

7. When steel structures first appeared, they were called a. skeleton frame. b. skeleton cage. c. steel skeleton. d. all of the above. e. none of the above.

d. all of the above.

14. The designation W14 * 38 means that the a. width of the section is 14 in. and the depth is 38 in. b. depth of the section is 14 in. and the width is 38 in. c. depth of the section is 14 in. and its weight is 38 lb/ft. d. nominal depth of the section is 14 in. and its weight is 38 lb/ft. e. none of the above.

d. nominal depth of the section is 14 in. and its weight is 38 lb/ft.

21. A K-series steel joist that is 20 in. deep cannot be used to span more than a. 20 ft. c. 30 ft. e. 40 ft. b. 25 ft. d. 35 ft.

e. 40 ft.

17. The acronym HSS stands for a. heat-strengthened steel. c. high-strength section. a. heat-strengthened steel. c. high-strength section. b. high-strength steel. d. hollow steel section. e. none of the above.

e. none of the above.

32. In a galvanized steel plate that carries the designation G60, the number 60 means that a. the total mass of zinc coating on both surfaces of the plate is 60 oz/ft2. b. the total mass of zinc coating on each surface of the plate is 60 oz/ft2. c. the total mass of zinc coating on both surfaces of the plate is 60 g/ft2. d. the total mass of zinc coating on each surface of the plate is 60 g/ft2. e. none of the above.

e. none of the above.