New Mexico CID GS-24 Structural Steel Erection Examination

On an erection drawing, what does the designation W16×36 identify?

• AA wide-flange beam about 16 in. deep that weighs 36 lb per linear foot
• BA 16 ft long beam that weighs 36 lb total
• CA plate 16 in. wide by 36 in. long
• DA 16 in. deep channel that weighs 36 kg per meter

What is the standard trade weight of a 1 in. thick carbon-steel plate per square foot?

• A490 lb/sq ft
• B40.8 lb/sq ft
• C20.4 lb/sq ft
• D12.5 lb/sq ft

A W16×36 beam is 40 ft long. What is its theoretical piece weight before fittings?

• A640 lb
• B1,600 lb
• C1,440 lb
• D3,600 lb

Estimate the weight of a 1/2 in. thick steel plate that is 4 ft wide by 8 ft long.

• A327 lb
• B1,306 lb
• C490 lb
• D653 lb

What unit weight do erectors use for carbon structural steel when converting volume to pounds?

• A490 lb/cu ft
• B150 lb/cu ft
• C40.8 lb/cu ft
• D62.4 lb/cu ft

A lift includes six W14×82 columns, each 28 ft long, and eight W18×50 beams, each 30 ft long. Ignoring fittings, what is the combined steel weight?

• A13,776 lb
• B25,776 lb
• C12,000 lb
• D21,336 lb

What is the standard end-bearing seat depth of a K-series steel joist so that joist tops align regardless of joist depth?

• A5 in.
• B4 in.
• C2-1/2 in.
• D1 in.

A 40 ft by 50 ft bay uses open-web joists spanning 40 ft at 5 ft on center, with a joist at each supporting girder. How many joists are required?

• A10
• B8
• C13
• D11

What is the typical coverage width of Type B steel roof deck used for sheet-count takeoffs?

• A36 in.
• B24 in.
• C12 in.
• D48 in.

A 90 ft by 120 ft roof uses Type B deck with 36 in. coverage. Sheets are 30 ft long and run the 120 ft direction. Ignoring waste and end-lap extra, how many sheets are required?

• A90 sheets
• B120 sheets
• C108 sheets
• D150 sheets

Compared with K-series joists, LH- and DLH-series joists are selected primarily because they can provide which combination?

• AShorter spans and lighter seats for residential floors only
• BCold-formed chords that replace all hot-rolled W beams
• CLonger spans and heavier loads, with a deeper standard seat
• DPermission to skip bridging on every span

What is the theoretical weight of a 3/4 in. steel plate that is 5 ft wide by 10 ft long?

• A2,040 lb
• B765 lb
• C1,020 lb
• D1,530 lb

A 90 ft by 120 ft roof takes 120 sheets of Type B deck at 36 in. coverage and 30 ft lengths. Add 5 percent waste for cuts and damaged sheets. How many sheets should be ordered?

• A126 sheets
• B120 sheets
• C132 sheets
• D114 sheets

Under NMAC 14.6.6, which work is outside the GS-24 Structural Steel Erection classification?

• AField-welding structural steel shapes used as building members
• BConstructing the concrete foundations that will receive the steel
• CErecting structural plates of any profile used as structural members
• DOn-site fabrication of structural steel shapes that will be erected

In OSHA Subpart R terms, what is a steel joist girder?

• AAny W-shape girder designed by the project structural engineer of record
• BA cold-formed Z-purlin in a metal building
• CAn open-web, manufacturer-designed primary member that supports floors or roofs
• DA secondary K-series joist 144 ft long or less

A 3/4 in. plate measures 36 in. by 96 in. Using 40.8 lb/sq ft per inch of thickness, what is its theoretical weight?

• A979 lb
• B367 lb
• C1,102 lb
• D734 lb

How does OSHA Subpart R distinguish a steel joist from a steel truss?

• AA steel joist is manufacturer-designed and 144 ft or less; a steel truss is designed by t…
• BA steel joist is always deeper than a steel truss
• CA steel truss may be walked without bridging, but a joist may not
• DThere is no distinction; the terms are interchangeable in Subpart R

OSHA Table A lists 32-0 for a 16K5 joist and NM for a 16K6. A 16K5 will span 34 ft-0 in. What erection-bridging action is required before the hoisting cables may be released?

• ANo bolted diagonal erection bridging is required because the joist is a K-series
• BInstall a row of bolted diagonal erection bridging near midspan and anchor it
• CInstall two rows of bolted diagonal bridging near the third points
• DInstall every row of bridging, because the span exceeds 100 ft

What feature distinguishes composite floor deck from typical painted roof deck?

• AA requirement that the deck never be fastened at supports
• BA standard coverage width of 72 in.
• CEmbossments or lugs that bond the deck to the concrete slab
• DUse only as a permanent exposed ceiling with no concrete

A cambered steel joist arrives with noticeable upward bow. What is the correct erection practice?

• ATurn the joist over so the bow is down to make the deck flat
• BHeat the bottom chord in the field until the camber disappears
• CCut a web member so the joist can settle onto the seats
• DErect it with the camber up as manufactured; do not flatten the joist

Sixteen joists weighing 14 lb/ft will each span 40 ft. What is the total joist steel weight before bridging and seats extras?

• A8,960 lb
• B560 lb
• C6,400 lb
• D22,400 lb

An erection drawing calls for an L4×4×3/8. What material is being shipped?

• AA 4 ft long lintel that weighs 4 lb/ft and is 3/8 in. thick
• BAn equal-leg angle with 4 in. legs and 3/8 in. thickness
• CA wide-flange beam 4 in. deep weighing 4 lb/ft
• DA 4 in. square HSS with 3/8 in. wall

A shipping list shows PL 3/4 × 12 × 1-6. How should the erector read that plate?

• AA plate 3/4 ft thick, 12 ft wide, and 16 in. long
• BA W12 beam 3/4 in. long with a 1-1/2 in. plate washer
• CA 3/4 in. thick plate, 12 in. wide, and 1 ft-6 in. long
• DA 12 ga sheet 3/4 in. wide and 16 ft long

How many 20 ft pieces of W12×26 are needed to furnish 160 linear feet of that mark, with no waste?

• A6 pieces
• B12 pieces
• C20 pieces
• D8 pieces

A lift contains six W21×44 beams, each 32 ft long, plus eight 1 in. base plates that are 2 ft by 2 ft. What is the combined theoretical steel weight?

• A9,754 lb
• B8,448 lb
• C1,306 lb
• D11,520 lb

Under OSHA 1926.753, what is the maximum number of members that may be hoisted in one multiple lift?

• A3
• B5
• C7
• D10

How far apart must members on a multiple-lift rigging assembly be rigged?

• AAt least 3 ft apart
• BNo more than 5 ft apart
• CAt least 7 ft apart
• DAny spacing the operator chooses

A 4,000 lb beam is hung on a two-leg bridle with each sling at 60 degrees from horizontal. Ignoring hitch and D/d reductions, what is the tension in each sling?

• A2,000 lb
• B4,000 lb
• C1,155 lb
• D2,309 lb

A 6,000 lb load hangs on a two-leg bridle with each sling at 30 degrees from horizontal. What is the tension in each sling?

• A6,000 lb
• B3,000 lb
• C3,464 lb
• D12,000 lb

Who must inspect the rigging used in steel erection, and when?

• AAny ironworker, once a week
• BA qualified rigger, prior to each shift
• CThe crane manufacturer, only after a critical lift
• DThe controlling contractor, at project start only

A 10,000 lb girder is slung on a two-leg bridle at 45 degrees from horizontal. What is the tension in each sling?

• A5,000 lb
• B10,000 lb
• C7,072 lb
• D3,536 lb

A 12,000 lb column is hoisted on a four-part line. Ignoring sheave friction, what is the line pull at the hoist drum?

• A12,000 lb
• B6,000 lb
• C2,000 lb
• D3,000 lb

Under OSHA 1926.751, which lift is a critical lift?

• AA lift that exceeds 75 percent of the crane’s rated capacity, or that uses more than one…
• BAny lift of a steel beam, regardless of weight
• COnly a lift that uses a personnel platform
• DAny lift performed before the pre-shift inspection

A wire-rope sling is rated 8,000 lb in a vertical hitch. Using the usual 75 percent choker reduction, what is its choker-hitch working load?

• A8,000 lb
• B6,000 lb
• C16,000 lb
• D4,000 lb

A 16,000 lb load is shared equally by a four-leg bridle with every leg at 60 degrees from horizontal. What is the tension in each leg?

• A4,000 lb
• B2,309 lb
• C4,619 lb
• D8,000 lb

In what order must a multiple lift be rigged and then set?

• ARig from the bottom up; set from the top down
• BRig and set whichever member is closest to the crane
• CRig all members at the same elevation; set the heaviest first
• DRig from the top down; set from the bottom up

An 18,000 lb load is supported on a six-part line. Ignoring friction, what is the hoist-line pull?

• A3,000 lb
• B6,000 lb
• C9,000 lb
• D18,000 lb

When may the safety latch on a crane hook be deactivated during steel erection?

• AWhenever the operator prefers a faster shake-out
• BWhen a qualified rigger determines that placing purlins or single joists is safer that wa…
• COn every multiple lift of beams
• DWhenever employees must work under the load

An 8,000 lb beam is on a two-leg bridle at 60 degrees from horizontal. What is each sling’s tension?

• A4,000 lb
• B8,000 lb
• C4,619 lb
• D2,309 lb

A 1/2 in. plate 4 ft by 10 ft (20.4 lb/sq ft) will be lifted on a two-leg bridle at 60 degrees from horizontal. What is each sling tension?

• A816 lb
• B408 lb
• C1,632 lb
• D471 lb

Who may be required to work directly under a suspended steel load?

• AOnly employees making the initial connection, or those hooking or unhooking the load
• BAny trade, if they wear hard hats
• CDeck crews placing shear connectors
• DThe controlling contractor’s inspectors at any time

In OSHA 1926.751, which device is not hoisting equipment?

• AA mobile crane
• BA come-along
• CA tower crane
• DA gin pole

What minimum safety factor must a multiple-lift rigging assembly provide for all components?

• A2 to 1
• B3 to 1
• C5 to 1
• D10 to 1

A W21×62 beam 40 ft long is lifted on a two-leg bridle at 30 degrees from horizontal. What is each sling tension?

• A1,240 lb
• B1,432 lb
• C4,960 lb
• D2,480 lb

When a multiple-lift load is over the connectors, which lowering method is required?

• AControlled load lowering using the hoist drive, not the load-hoist brake alone
• BFree-spooling the drum against the brake
• CShock-loading the boom to seat the beam
• DLowering with a come-along hung from the headache ball

What is the OSHA minimum number of anchor rods for a structural column?

• A2
• B4
• C1
• D6