Deck 18: Material Steel and Steel Components

Question 1

An electric arc furnace uses

A)three electrodes to melt iron ore.
B)two electrodes to melt steel scrap.
C)three electrodes to melt steel scrap.
D)two electrodes to melt iron ore.
E)none of the above.

Answer 1

C

Question 2

Which of the following does not represent a steel joist series?

A)K- series
B)J- series
C)H- series
D)DLH- series
E)LH- series

Answer 2

B

Question 3

W- shape, S- shape, HP- shape, and M- shape are all structural steel I- sections.

Answer 3

True

Question 4

Slag is

A)the ore used for making steel.
B)the ore used for making aluminum.
C)a waste product generated from the manufacture of steel.
D)a ferrous metal that has been replaced by steel.
E)none of the above.

Question 5

The mini- mill method of steel manufacturing predates the integrated- mill method.

Question 6

Which of the following statements is true?

A)All structural steel sections are made by preheating billets or blooms and rolling them to shape.
B)All structural steel sections are made from billets or blooms that are rolled to shape at room temperature.
C)All structural steel sections are made by preheating steel sheets and bending them to the required cross sections.
D)All structural steel sections are made by bending steel sheets to the required cross sections at room temperature.
E)None of the above.

Question 7

A W- shape section is so called because

A)its cross- sectional shape resembles the letter W.
B)it is a rectangular section whose width is larger than its depth.
C)it is an I- section with a wide web.
D)it is an I- section with wide flanges.

Question 8

The acronym HSS stands for

A)high- strength steel.
B)heat- strengthened steel.
C)hollow steel section.
D)high- strength section.
E)none of the above.

Question 9

The steel type most commonly used for framing members (columns and beams)of a steel building is

A)steel type A992 with a yield strength of 50 ksi.
B)steel type A992 with a yield strength of 40 ksi.
C)steel type A36 with a yield strength of 360 ksi.
D)steel type A36 with a yield strength of 36 ksi.
E)none of the above.

Question 10

In the steel joist designation 24LH10, the number 24 gives the

A)weight of the joist in pounds per foot.
B)depth of the joist in inches.
C)length of the joist in feet.
D)number of web members.
E)none of the above.

Question 11

An integrated mill produces steel using

A)25% to 50% iron ore plus 25% to 50% scrap.
B)steel scrap.
C)iron ore.
D)none of the above.

Question 12

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

Question 13

Which of the following ferrous metals is least corrosion resistant?

A)Wrought iron
B)Steel
C)Cast iron

Question 14

When steel structures first appeared, they were called

A)steel skeleton.
B)skeleton frame.
C)skeleton cage.
D)all of the above.
E)none of the above.

Question 15

Steel decks are made from cold- formed steel.

Question 16

Which of the following steel shapes is most commonly used for the structural frame of buildings?

A)HP- shape
B)M- shape
C)S- shape
D)W- shape
E)C- shape

Question 17

To obtain the structural engineering properties of standard steel sections, the following publication is generally used.

A)Steel Construction Manual
B)ASTM standard on steel sections
C)Local manufacturers' literature
D)Steel Fabricators' Manual
E)Steel Erectors' Manual

Question 18

HSS members are made by

A)cold rolling of steel blooms.
B)hot rolling of steel blooms.
C)bending and welding heated steel plates.
D)casting molten steel to shape.
E)any one of the above, depending on the manufacturer.

Question 19

The designation W14 × 38 means that the

A)depth of the section is 14 in. and its weight is 38 lb/ft.
B)depth of the section is 14 in. and the width is 38 in.
C)nominal depth of the section is 14 in. and its weight is 38 lb/ft.
D)width of the section is 14 in. and the depth is 38 in.
E)none of the above.

Question 20

Which of the following ferrous metals has the largest amount of carbon?

A)Wrought iron
B)Steel
C)Cast iron

Question 21

Spray- on fire protection materials for steel contain

A)Portland cement with normal- weight aggregate.
B)Portland cement with mineral fibers or lightweight aggregate.
C)polymer- based cement with normal- weight aggregate.
D)polymer- based cement with mineral fibers or lightweight aggregate.
E)any one of the above, depending on the manufacturer.

Question 22

Roof decks are anchored to supporting members by continuous welds along the support lines.

Question 23

Steel, stainless steel, cast iron, and wrought iron are some of the ferrous metals. Which of these metals is no longer produced and why?

Question 24

Which of the following decks requires structural concrete topping?

A)Composite deck
B)Form deck
C)Floor deck
D)All of the above
E)None of the above

Question 25

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

Question 26

Steel roof decks are either form decks or composite decks.

Question 27

Fire- protection of structural steel framing members is mandated by building codes for all buildings.

Question 28

A K- series steel joist that is 20 in. deep cannot be used to span more than

A)35 ft.
B)25 ft.
C)20 ft.
D)30 ft.
E)40 ft.

Question 29

What is slag?

Question 30

A pour stop is generally used with

A)roof decks.
B)floor decks.
C)A and B.
D)none of the above.

Question 31

Iron ore is obviously the primary raw material in the manufacturing of steel using the traditional integrated mill method. Which other materials are mixed with iron ore to manufacture steel and what are their roles?

Question 32

Steel joists are braced against instability by

A)horizontal bridging members at the top of the joists.
B)horizontal bridging members at the bottom of the joists.
C)A or B.
D)A and B.
E)none of the above.

Question 33

The thickness of sheet steel in a roof or floor deck is generally specified in terms of

A)gauge number.
B)inches.
C)millimeters.
D)any one of the above.

Question 34

Diagonal bridging may be used as an alternative to horizontal bridging to stabilize steel joists.

Question 35

In a galvanized steel plate that carries the designation G60, the number 60 means that

A)the total mass of zinc coating on each surface of the plate is 60 oz/ft2.
B)the total mass of zinc coating on both surfaces of the plate is 60 g/ft2.
C)the total mass of zinc coating on both surfaces of the plate is 60 oz/ft2.
D)the total mass of zinc coating on each surface of the plate is 60 g/ft2.
E)none of the above.

Question 36

Steel floor decks are either form decks or composite decks.

Question 37

Because of the manufacturing process, ferrous metals contain a certain amount of carbon. Cast iron has much larger amount of carbon (2.5% to 4%)as compared with steel (0.1% to 1.7%). How does carbon affect the property of cast iron and steel?

Question 38

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

Question 39

Steel, stainless steel, cast iron, and wrought iron are the important ferrous metals. Which was discovered first, and which other ferrous metal followed it?

Question 40

Two dissimilar metals are generally separated from each other by a separator, which helps to prevent

A)atmospheric corrosion.
B)galvanic corrosion.

Question 41

What is a built- up steel section and where is it needed?

Question 42

What is the relationship between a WT section and a W- section?

Question 43

What is cold- formed (CFS)steel?

Question 44

Are steel joists and joist girders made of cold- formed steel or structural steel?

Question 45

What does grade- 50 steel mean?

Question 46

Name (i)the steel joist manufactures association and (ii)the steel deck manufacturers association along with their respective acronyms.

Question 47

What is the difference between an equal- leg angle and an unequal- leg angle?

Question 48

What are structural steel components?

Question 49

What is a plate- girder and where is it needed?

Question 50

Explain what W21 × 68 means.

Question 51

Is a steel deck made of cold- formed steel or structural steel?

Question 52

What is slag and what is it used for?

Question 53

Is reinforcing steel part of structural steel? Explain.

Question 54

What is the raw material for the manufacture of steel in the mini- mill method?

Question 55

The Steel Joist Institute (SJI)produces joists in three groups, each group referred to as a series. The three series are called: K- series joists, LH- series joists, and DLH- series joists. Which series is most commonly used?

Question 56

What is a bent- plate section and where is it needed?

Question 57

Explain what C 8× 11.5 means.

Question 58

Which other term is used for "cold- formed steel"?

Question 59

What is the difference between a beam and a girder?

Question 60

What is the cross- sectional profile of (i)W- shape and (ii)steel deck?

Question 61

What does the galvanizing term "G60" mean?

Question 62

Discuss the difference between hot rolling and cold forming of steel and their uses in making steel components.

Question 63

Discuss the two methods used in manufacturing steel, giving their relative advantages and disadvantages.

Question 64

Steel is subject to corrosion. Does it mean that all structural steel used in buildings must be protected against corrosion? Explain with reasons.

Question 65

What is galvanizing?

Question 66

A K- series joist is identified by two numbers separated by letter K, such as 14K3. Explain what information is provided by the marks 14K3 and 14K1.

Question 67

Which of the following three joists, 12K1, 12K3, and 12K5 has the highest load- carrying capacity for the same span, and which has the least load- carrying capacity and why?

Question 68

What is the maximum span over which a K- series joist (such as 14K1 joist)can be used?

Question 69

What is hot- dip galvanizing?

Question 70

Sketch the commonly used hot- rolled sections used in building construction.

Question 71

Using sketches, show the important difference between the W- shapes used for beams and those used for columns.

Question 72

Steel decks are made in two types-roof decks and floor decks. Which material(s)cover(s)a roof deck from above and which cover a floor deck from above?

Question 73

Steel is a noncombustible material. So why do steel components in buildings, such as W- section beams, steel joists, and joist girders, need protection against fire?

Question 74

Floor decks are made in two types. Name them.

Question 75

Which is the most commonly used method of providing fire protection to steel members?

Question 76

Floor decks are made in two types-form deck and composite deck. What is a form deck?

Question 77

Floor decks are made in two types-form deck and composite deck. What is a composite deck?

Question 78

Discuss the basic differences (in terms of chemical composition and important properties)among wrought iron, cast iron, and steel. Where would you recommend the use of wrought iron?

Question 79

What does the top chord and bottom chord of a K- series joist consist of?

Question 80

Which of the two floor deck types has surface protrusions and depressions and why?