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NCCER Ironworker practice questions

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Question 1Ironworking

Which grade of bolt is typically required for a slip-critical connection in structural steelwork?

  1. A563 Grade A nuts only
  2. A307
  3. F1554 Grade 36
  4. A325 or A490 Correct answer.

Explanation

Slip-critical connections rely on high clamping force so the faying surfaces do not slip under service load. That requires high-strength structural bolts such as A325 or A490 tensioned to the specified pretension. A307 is a low-strength bolt not permitted for slip-critical joints.

Question 2Ironworking

When erecting a multi-story structural steel frame, what is the primary purpose of guying and plumbing the first tier before final bolting?

  1. To permit removal of the crane from the site early
  2. To preload the anchor rods to final tension
  3. To establish a true, stable base so subsequent tiers are erected plumb Correct answer.
  4. To allow welding of column splices before bolts are installed

Explanation

The first tier sets the alignment reference for the whole frame, so it is plumbed, guyed, and temporarily secured before erection continues upward. Errors at the base multiply with height. Final anchor-rod tensioning and welding follow later in the sequence.

Question 3Ironworking

What does the 'turn-of-nut' method use to verify that a structural bolt has reached the required pretension?

  1. An ultrasonic length measurement of the bolt shank
  2. A dye-penetrant check on the nut face
  3. A calibrated torque wrench reading in ft-lb
  4. A specified rotation of the nut from the snug-tight condition Correct answer.

Explanation

Turn-of-nut tightening controls pretension by rotating the nut (or head) a specified fraction of a turn after the joint is snug. The required rotation depends on bolt length and surface condition. Torque values are used in the calibrated wrench method, not turn-of-nut.

Question 4Ironworking

A connection drawing calls for a 7/8 in. diameter A325 bolt. What is the standard hole diameter for a standard (non-oversized) hole?

  1. 15/16 in. Correct answer.
  2. 1 in.
  3. 7/8 in.
  4. 13/16 in.

Explanation

Standard holes for bolts are punched or drilled 1/16 in. larger than the bolt diameter, so a 7/8 in. bolt uses a 15/16 in. standard hole. Oversized and short-slot holes are larger and are permitted only where the design allows.

Question 5Ironworking

In a bolted shear connection, why are hardened washers required under the turned element for A490 bolts?

  1. To distribute clamping force and prevent galling or brinelling during tightening Correct answer.
  2. To increase the slip resistance of the faying surface
  3. To compensate for an oversized hole
  4. To electrically isolate the bolt from the steel

Explanation

Hardened washers spread the tightening force and protect the steel and nut face from gouging when high-strength bolts are tensioned. They do not change the faying-surface slip coefficient. Oversized holes are handled by the design, not by adding washers.

Question 6Ironworking

Which welding process is most commonly used for field welding of structural steel on an ironworker crew?

  1. Submerged arc welding (SAW)
  2. Shielded metal arc welding (SMAW) Correct answer.
  3. Electroslag welding
  4. Gas tungsten arc welding (GTAW)

Explanation

SMAW, often called stick welding, is portable and tolerant of wind and outdoor conditions, making it the standard field process for structural steel. SAW and electroslag are shop processes requiring automated or stationary equipment. GTAW is used for thin or specialty metals, not heavy structural field welds.

Question 7Ironworking

What is the minimum required length of a fillet weld if the leg size is 1/4 in.?

  1. 1/2 in.
  2. 3/4 in.
  3. 1 in.
  4. 1/4 in. Correct answer.

Explanation

Code minimum for fillet weld length is four times the weld size, but never less than 1-1/2 in. For a 1/4 in. fillet, four times the size is 1 in., which governs. The 1-1/2 in. absolute minimum controls only for smaller welds.

Question 8Ironworking

A welder must make a groove weld on a thick column splice. What does the term 'root opening' refer to?

  1. The distance from the weld toe to the weld centerline
  2. The width of the weld cap
  3. The depth of penetration into the base metal
  4. The gap between the two members at the bottom of the joint preparation Correct answer.

Explanation

Root opening is the separation left between the parts at the root of a groove joint before welding. It allows access for the arc and helps ensure full penetration. Penetration depth and cap width are separate weld features.

Question 9Ironworking

Why must ironworkers avoid galvanic corrosion when fastening aluminum handrail to a steel structure?

  1. Steel expands more than aluminum when heated
  2. Dissimilar metals in contact with moisture create a corrosion cell that attacks the aluminum Correct answer.
  3. Aluminum bolts cannot be tensioned properly
  4. Aluminum is stronger than steel and will crush the steel

Explanation

When two dissimilar metals contact in the presence of an electrolyte, a galvanic cell forms and the more active metal, aluminum here, corrodes. Isolating washers or coatings break the electrical contact. Strength and thermal expansion differences are separate design concerns.

Question 10Ironworking

What is the purpose of a drift pin during steel erection?

  1. To cut oversized holes to final size
  2. To measure the tension in a bolt
  3. To align bolt holes so connecting members can be brought together Correct answer.
  4. To provide temporary weld backing

Explanation

A drift pin is driven into misaligned holes to bring members into alignment so bolts can be installed. It is a temporary alignment tool, not a tension-measuring device or a cutting tool. Weld backing is a separate item.

Question 11Ironworking

A beam is to be temporarily supported while its connections are made. Which method is standard practice for a single-story steel frame?

  1. Leave the crane holding the beam until all bolts are fully tensioned
  2. Install at least two snug-tight bolts at each connection before releasing the crane Correct answer.
  3. Rely on friction alone with no bolts until the next day
  4. Weld the beam flanges to the column before bolting

Explanation

Standard practice is to place a minimum number of snug-tight bolts (typically two per connection) to secure the member before the crane is released. Final tensioning follows. Holding the load with the crane during full tensioning is unsafe and inefficient.

Question 12Ironworking

What does a 'snug-tight' condition mean for a structural bolt?

  1. The bolt is finger tight only
  2. The bolt is tightened until the nut strips
  3. The bolt is tensioned to its full proof load
  4. The bolt is brought to firm contact by a few impacts of an impact wrench or the full effort of a worker with an ordinary spud wrench Correct answer.

Explanation

Snug-tight is the initial condition of firm contact achieved by a few impacts of an impact wrench or the full effort of a worker with a spud wrench. It is the starting point for turn-of-nut tensioning. It is not full pretension, nor is it finger tight.

Question 13Ironworking

When erecting a steel frame, why are temporary guys and bracing installed?

  1. To carry the permanent design loads after completion
  2. To provide stability against wind and erection loads until permanent bracing is in place Correct answer.
  3. To align the crane's boom
  4. To preload the foundation

Explanation

During erection the frame may lack its permanent lateral system, so temporary guys and bracing keep it stable against wind and construction loads. They are removed or supplemented once permanent bracing is complete. They do not carry final design loads or align the crane.

Question 14Ironworking

Which document governs the acceptance criteria for high-strength bolted joints on a structural steel project?

  1. The crane operator's manual
  2. The project's approved construction documents and the applicable bolting specification Correct answer.
  3. The welder's certification card
  4. The bolt manufacturer's catalog

Explanation

Acceptance criteria come from the approved construction documents, which reference the applicable structural bolting specification. Manufacturer catalogs and operator manuals are informational, not governing. Welder certification applies to welding, not bolting.

Question 15Ironworking

What is the primary safety hazard addressed by a controlled decking zone during steel deck installation?

  1. Electrical shock from temporary power
  2. Noise from impact wrenches
  3. Welding fume exposure
  4. Falls from the leading edge before the deck is secured Correct answer.

Explanation

A controlled decking zone limits access and controls work so that fall hazards at the leading edge are managed while deck is being placed and secured. It addresses fall protection specifically. Fume, noise, and electrical hazards are handled by other controls.

Question 16Ironworking

At what height above a lower level does OSHA generally require fall protection for ironworkers on a structural steel frame?

  1. 4 ft
  2. 15 ft Correct answer.
  3. 6 ft
  4. 25 ft

Explanation

For structural steel erection, fall protection is generally required at 15 ft above a lower level, with specific provisions for connectors and decking. The 4 ft and 6 ft thresholds apply to general industry and some construction activities, not steel erection.

Question 17Ironworking

What is the purpose of a column splice in a multi-story steel building?

  1. To attach a beam to a column
  2. To provide lateral bracing between columns
  3. To join two column sections end to end so the column can be shipped and erected in lengths Correct answer.
  4. To connect a column to its foundation

Explanation

Column splices join column segments end to end, allowing mill lengths and shipping limits to be accommodated. Base plates connect columns to foundations, and beam seats or framing angles connect beams. Bracing is a separate system.

Question 18Ironworking

A detail shows a 'shear tab' connection. What is the shear tab?

  1. A stiffener welded between column flanges
  2. A plate bolted to the beam flange to resist bending
  3. A temporary erection angle removed after bolting
  4. A plate welded to the column and bolted to the beam web to transfer shear Correct answer.

Explanation

A shear tab is a single plate welded to the supporting member and bolted to the supported beam web, transferring shear. It does not resist significant moment, and it is not temporary. Stiffeners serve a different purpose.

Question 19Ironworking

Which of these is a direct-tension indicator used to verify bolt pretension?

  1. A hardened washer with protrusions that compress as the bolt is tensioned Correct answer.
  2. A feeler gauge
  3. A hydraulic torque wrench
  4. A torque multiplier

Explanation

A direct-tension indicator is a hardened washer with protrusions that flatten as the bolt reaches the required tension, giving a visual check. Torque multipliers and hydraulic wrenches apply torque but are not indicators. A feeler gauge measures gaps, not tension.

Question 20Ironworking

What is the function of a beam seat (unframed connection) in steel erection?

  1. To support the beam end and transfer shear while allowing simple erection Correct answer.
  2. To transfer bending moment between beam and column
  3. To provide lateral bracing to the column
  4. To connect the column to its foundation

Explanation

A beam seat supports the end of a beam and transfers shear, and it simplifies erection by giving the beam a bearing surface. It is a simple connection and does not transfer significant moment. Bracing and base plates are separate functions.

Question 21Ironworking

Why is preheat sometimes specified before welding thick structural steel?

  1. To reduce the weld size required
  2. To slow the cooling rate and reduce the risk of cracking Correct answer.
  3. To increase the welding current
  4. To clean the weld surface

Explanation

Preheating raises the base-metal temperature so the weld cools more slowly, which reduces hardening and the risk of hydrogen cracking in thick sections. It does not change the required weld size or substitute for cleaning.

Question 22Ironworking

What does 'plumbness' refer to when checking an erected steel column?

  1. The gap at a column splice
  2. The vertical alignment of the column Correct answer.
  3. The torque on the anchor rods
  4. The horizontal alignment of the beam

Explanation

Plumbness is the verticality of a column, checked with a level, plumb line, or transit. It is distinct from beam elevation, anchor-rod torque, and splice gaps. Plumb columns are essential for the frame to align correctly.

Question 23Ironworking

A crew is installing a moment connection that requires complete-joint-penetration groove welds. Why is weld backing often used?

  1. To eliminate the need for a qualified welder
  2. To reduce the required preheat
  3. To increase the weld's tensile strength beyond the base metal
  4. To support the molten weld metal and help achieve full root fusion Correct answer.

Explanation

Backing retains molten metal at the root and supports full penetration when welding from one side. It does not raise the weld strength above the base metal or remove the need for qualified welders and procedures. Preheat requirements are independent.

Question 24Ironworking

Which condition is most likely to cause hydrogen-induced cracking in a structural weld?

  1. Excessive preheat
  2. Low ambient humidity
  3. Moisture on the electrode or joint and rapid cooling Correct answer.
  4. Using a qualified welding procedure

Explanation

Hydrogen cracking requires hydrogen, a susceptible microstructure, and restraint. Moisture introduces hydrogen, and rapid cooling promotes hard microstructures that crack. Low humidity and proper preheat reduce risk, and a qualified procedure is a control, not a cause.

Question 25Ironworking

During erection, a bolt hole in a beam web does not align with the shear tab. What is the acceptable first step?

  1. Use a drift pin to align the holes and install a bolt Correct answer.
  2. Enlarge the hole with a torch without approval
  3. Cut the shear tab off and re-weld it
  4. Weld the gap closed

Explanation

Minor misalignment is corrected with a drift pin so a bolt can be installed. Flame-cutting or enlarging holes without engineering approval is not permitted, and welding or removing the connection is a design change. Any hole modification requires approval.

Question 26Ironworking

Before a load is applied, what does the term 'dead load' mean for a steel structure?

  1. The force from a crane lifting a beam into place
  2. The weight of workers, tools, and stacked material
  3. The force from wind gusts on the erected frame
  4. The weight of the structure and permanently attached components Correct answer.

Explanation

Dead load is the permanent, fixed weight of the structure itself plus anything permanently attached, such as deck, cladding, and mechanical equipment. It stays constant over the life of the building and is used in design calculations as a sustained force.

Question 27Ironworking

Which tool is the standard choice for tightening high-strength structural bolts to a specified tension?

  1. A hydraulic rebar bender
  2. An impact wrench with a turning socket Correct answer.
  3. A pneumatic chipping hammer
  4. A calibrated torque wrench

Explanation

High-strength bolts in structural steel are normally installed with an impact wrench, and pretension is verified with a turn-of-nut, tension calibrator, or direct-tension indicator. Torque is not a reliable measure of bolt tension because friction varies.

Question 28Ironworking

What is the primary purpose of a spud wrench on an ironworker crew?

  1. Cutting steel plate to length
  2. Aligning bolt holes while starting connections Correct answer.
  3. Testing the tension in a bolt
  4. Measuring the plumbness of a column

Explanation

A spud wrench has a tapered handle that is inserted into misaligned holes to bring them into line so bolts can be inserted. The wrench end is used to make up the nuts on the connection.

Question 29Ironworking

Which hand signal tells a crane operator to raise the load?

  1. Arm extended upward, index finger pointing up, hand moving in a small circle Correct answer.
  2. Arm extended downward, hand open, moving side to side
  3. Fist clenched and moved in a chopping motion
  4. Both hands held flat and crossed at the wrists

Explanation

The standard raise signal is the forearm raised with the index finger pointing up and the hand circling. Ironworkers and operators must use one agreed set of signals so hoisting commands are never ambiguous.

Question 30Ironworking

What does the term 'plumb' mean when checking an erected steel column?

  1. The column has been fully bolted
  2. The column is level across its base plate
  3. The column is perfectly vertical Correct answer.
  4. The column is painted and protected

Explanation

Plumb means truly vertical, and ironworkers check it with a level, plumb bob, or transit before final connections are made. Plumbness affects the alignment of the whole frame above.

Question 31Ironworking

Which type of steel deck is commonly used as a permanent form for a concrete floor slab?

  1. Roof deck
  2. Cellular deck
  3. Composite deck
  4. Form deck Correct answer.

Explanation

Form deck is used as permanent formwork for concrete but is not counted on for composite action with the slab. Composite deck has shear studs and embossments that bond it to the concrete so the two act together.

Question 32Ironworking

What is the purpose of a temporary bent in steel erection?

  1. To permanently carry the building's floor loads
  2. To anchor the crane's outriggers
  3. To provide temporary support for a partially erected frame Correct answer.
  4. To protect workers from falling objects

Explanation

A temporary bent is a falsework frame that supports a portion of the steel structure until enough permanent framing and connections are complete to carry the loads. It is removed after the frame is stable.

Question 33Ironworking

Which bolt grade is a common high-strength structural bolt used in steel connections?

  1. A36
  2. A307
  3. A500
  4. A325 Correct answer.

Explanation

A325 and A490 are the classic high-strength structural bolt grades used in steel connections. A307 is a lower-strength bolt used where high tension is not required.

Question 34Ironworking

A detail specifies a 'slip-critical' bolted connection. What does this mean?

  1. The connection relies on welding instead of bolts
  2. The bolts are designed to fail in shear at the ultimate load
  3. The connection is designed so the joined parts do not slip under service load Correct answer.
  4. The bolts are tightened only to snug-tight condition

Explanation

In a slip-critical connection the bolts are pretensioned so the friction between the clamped plates prevents any slip at service loads. It is used where slip would be unacceptable, such as in oversized or slotted holes.

Question 35Ironworking

Why are oversized holes sometimes used in a bolted steel connection?

  1. To eliminate the need for washers
  2. To reduce the required bolt tension
  3. To make the connection act as a slip-critical joint
  4. To allow for erection tolerances and easier fit-up Correct answer.

Explanation

Oversized holes provide tolerance for fabrication and erection so members can be aligned without reaming. Because they reduce bearing area, they are usually limited to specific connection types and require hardened washers.

Question 36Ironworking

A column is being set on anchor rods and the base plate does not sit level. What is the usual first corrective action?

  1. Loosen all anchor rod nuts and leave them finger tight
  2. Weld the base plate down as it sits
  3. Cut the anchor rods to lower the plate
  4. Shim and level the base plate before final grouting Correct answer.

Explanation

Base plates are leveled with shims or leveling nuts before grout is placed so the column starts plumb and the load is transferred evenly. Grout is placed after alignment is confirmed.

Question 37Ironworking

What is the purpose of shear studs welded to a steel beam top flange?

  1. To provide a lifting point for the crane
  2. To transfer shear between the steel beam and the concrete slab Correct answer.
  3. To align the beam during erection
  4. To protect the flange from corrosion

Explanation

Shear studs are welded through the deck to the top flange and embed in the concrete slab, so the beam and slab act as a composite unit. They carry the horizontal shear between steel and concrete.

Question 38Ironworking

During steel erection, a beam is being landed on two column brackets. What is the safest practice for the ironworker guiding the beam?

  1. Place a hand between the beam and the seat to feel alignment
  2. Reach under the beam to guide it onto the seat
  3. Stand clear and use a tag line to control the beam Correct answer.
  4. Ride the beam down to the connection

Explanation

The worker should stay clear of the pinch points and control the load with a tag line so hands are never between the beam and the seat. This prevents crush injuries during landing.

Question 39Ironworking

A crew must connect a beam whose holes are slightly out of alignment with the column bracket. Which action is acceptable before bolts are installed?

  1. Weld the beam to the bracket temporarily
  2. Force the beam with a come-along until the holes line up
  3. Enlarge the hole with a torch
  4. Use a drift pin to align the holes Correct answer.

Explanation

A drift pin is the standard tool for bringing slightly misaligned holes into line so bolts can be inserted. Holes may only be enlarged by approved reaming, never by burning.

Question 40Ironworking

What does the term 'erection tolerance' refer to in steel construction?

  1. The minimum bolt tension required
  2. The thickness of the protective coating on steel
  3. The permissible variation in the position of erected members Correct answer.
  4. The maximum load a crane may lift

Explanation

Erection tolerances are the allowed deviations in plumb, elevation, and alignment of erected steel. They are set by the project specifications and industry standards so the frame fits together and finishes can be installed.

Question 41Ironworking

Which condition most increases the risk of a crane tipping during steel erection?

  1. Keeping the boom at a low angle with a light load
  2. Lifting a load beyond the rated capacity at the working radius Correct answer.
  3. Using a tag line to control the load
  4. Operating with outriggers fully extended on firm ground

Explanation

A crane tips when the load moment exceeds the machine's stability, which happens when the load or radius exceeds the load chart. The operator must always check the rated capacity at the actual working radius.

Question 42Ironworking

A beam is to be temporarily supported while its connections are made. Which method is standard practice?

  1. Rely on the friction of the crane sling to hold it
  2. Weld the beam to the column immediately
  3. Leave the beam hanging from the crane hook until all bolts are installed
  4. Set the beam on temporary supports or seats and connect it before releasing the hook Correct answer.

Explanation

The beam is landed on its seats or temporary supports and at least enough bolts are installed to stabilize it before the crane is released. Leaving a load suspended while workers connect it is unsafe and not permitted.

Question 43Ironworking

Which document typically governs the acceptance criteria for high-strength bolted joints on a structural steel project?

  1. The shop painting schedule
  2. The crane load chart
  3. The project specifications and the applicable bolting standard Correct answer.
  4. The welding procedure specification

Explanation

The project specifications, together with the referenced bolting standard, set the installation and inspection requirements for high-strength bolts. The ironworker must follow those criteria for pretension and inspection.

Question 44Ironworking

A column is found to be out of plumb after erection. What is the appropriate first step?

  1. Ignore the deviation if it is small
  2. Add extra bolts to pull the column straight
  3. Loosen the connections and realign the column using the anchor and connection adjustments Correct answer.
  4. Cut the column and re-weld it

Explanation

Out-of-plumb columns are corrected by loosening the connections and using jacks, come-alongs, or anchor adjustments to bring the member back within tolerance. Cutting or welding the column is not a field fix.

Question 45Ironworking

Why must a controlled decking zone be established during steel deck installation?

  1. To control access and limit fall exposure while the deck is being placed Correct answer.
  2. To allow the crane to swing over the deck
  3. To keep the deck from being damaged by the crane
  4. To provide a storage area for tools

Explanation

A controlled decking zone limits who may enter and requires fall protection while deck panels are being laid and before they are secured. It addresses the fall hazard created by unsecured leading-edge deck.

Question 46Ironworking

During a bolted connection inspection, a turn-of-nut installation is being verified. What does the inspector check?

  1. The final torque reading on the wrench
  2. The length of the bolt shank
  3. The amount of rotation applied to the nut from the snug-tight condition Correct answer.
  4. The color of the bolt head

Explanation

Turn-of-nut pretension is verified by the specified rotation of the nut or bolt head from the snug-tight condition, which is related to bolt diameter and grip length. Torque is not the acceptance criterion for this method.

Question 47Ironworking

A moment connection requires complete-joint-penetration groove welds. Why is backing sometimes used?

  1. To increase the welding current
  2. To support the root pass and ensure full fusion at the joint root Correct answer.
  3. To reduce the need for preheat
  4. To allow the weld to be made without a welder qualification

Explanation

Backing supports the molten root so the welder can achieve full penetration and fusion at the joint root. It is removed or left in place depending on the detail and specification.

Question 48Ironworking

A crew is erecting a multi-story frame and must decide how to provide temporary stability before permanent bracing is installed. Which approach is correct?

  1. Weld every connection as it is erected
  2. Install temporary guys, cables, or bracing until the permanent system is complete Correct answer.
  3. Rely on the friction of the bolted connections alone
  4. Leave the frame unbraced until the roof is placed

Explanation

Temporary guys, cables, or bracing keep a partially erected frame stable until enough permanent bracing and connections are in place to resist lateral loads. A frame without them can rack or collapse.

Question 49Ironworking

What does the term 'erection plan' typically include for a steel project?

  1. The sequence of erection, crane positions, and temporary bracing requirements Correct answer.
  2. The paint color schedule
  3. The list of office staff
  4. The payroll schedule for the crew

Explanation

An erection plan sets out the sequence of placing members, crane locations and capacities, temporary bracing, and stability requirements. It is prepared by the erector and reviewed before work begins.

Question 50Ironworking

When erecting structural steel, what is the primary purpose of a drift pin?

  1. To align bolt holes in connecting members Correct answer.
  2. To clean the threads of a bolt
  3. To measure the tension in a bolt
  4. To provide temporary support for a beam

Explanation

A drift pin is a tapered steel tool used to align holes in steel members so that bolts can be inserted. It is not used for measuring tension, supporting beams, or cleaning threads. Proper alignment with a drift pin helps ensure that connections fit together correctly.