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New Mexico (NM) GS-24 Structural Steel
Erection Exam | Latest Verified Questions
and Detailed Answers
OVERVIEW DESCRIPTION:
This comprehensive collection of 300 multiple-choice questions is designed to thoroughly
prepare candidates for the New Mexico GS-24 Structural Steel Erection Exam. The questions are
meticulously crafted to cover all major aspects of the trade, including the identification and
properties of steel materials, standard shapes and profiles, and corrosion protection methods. A
significant portion focuses on critical rigging principles, equipment inspection, and load
calculations. The set also delves into the core practices of steel erection, such as structural
assembly, bolting and welding connections, and the installation of bracing and decking. Finally,
it rigorously addresses essential safety protocols, from the proper use of personal protective
equipment (PPE) to the identification and mitigation of site-specific hazards. Each question is
presented with the correct answer and a concise expert rationale to reinforce learning and clarify
industry best practices, aligning with both OSHA standards and the specific requirements of the
New Mexico exam.
NM GS-24 Structural Steel Erection Exam Practice Questions
QUESTION 1
Which ASTM specification is most commonly specified for W-shapes (wide flange
beams) in building construction due to its optimized strength-to-weight ratio and
weldability?
A. ASTM A36
B. ASTM A572
C. ASTM A992
D. ASTM A514
CORRECT ANSWER: C
EXPERT RATIONALE: ASTM A992 is the preferred material for W-shapes as it offers a
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50 ksi minimum yield strength and a maximum yield-to-tensile ratio, ensuring good
ductility and weldability for seismic applications.
QUESTION 2
What is the primary purpose of applying a galvanized coating to structural steel?
A. To increase the tensile strength of the steel.
B. To provide a smooth surface for painting.
C. To prevent corrosion through sacrificial protection.
D. To improve the steel's ductility during erection.
CORRECT ANSWER: C
EXPERT RATIONALE: Galvanization applies a layer of zinc, which acts as a barrier and
a sacrificial anode, corroding in place of the underlying steel to protect it from rust.
QUESTION 3
When rigging a steel beam for a lift, what is the function of a spreader bar?
A. To connect the beam to the crane hook.
B. To shorten the length of the slings.
C. To minimize horizontal compression forces on the beam.
D. To equalize the load between two cranes.
CORRECT ANSWER: C
EXPERT RATIONALE: A spreader bar converts angulated sling forces into vertical
compression, preventing the beam from being crushed or bent by the inward pull of
the slings during the lift.
QUESTION 4
According to OSHA, what is the minimum required distance for cranes operating near
power lines rated 50 kV or below?
A. 5 feet
B. 10 feet
C. 15 feet
D. 20 feet
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CORRECT ANSWER: B
EXPERT RATIONALE: OSHA regulation 1926.1408 requires a minimum clearance of 10
feet for power lines rated 50 kV or below to prevent electrocution.
QUESTION 5
What is the primary reason for installing temporary guy wires or braces during steel
column erection?
A. To provide a grounding path for lightning.
B. To support the dead load of the column before connections are made.
C. To maintain stability and plumbness until permanent connections are complete.
D. To serve as a attachment point for hoisting lines.
CORRECT ANSWER: C
EXPERT RATIONALE: Temporary bracing is critical to stabilize columns and beams
against wind, seismic forces, or accidental impacts during the erection process,
ensuring the structural frame's stability until it is self-supporting.
QUESTION 6
The property of steel that allows it to bend, twist, or elongate significantly before
fracturing is known as:
A. Tensile strength.
B. Yield strength.
C. Ductility.
D. Hardness.
CORRECT ANSWER: C
EXPERT RATIONALE: Ductility is the ability of a material to undergo plastic deformation
under tensile load before rupture. This is a vital safety feature, giving warning before
failure and allowing for force redistribution.
QUESTION 7
Which type of steel shape is designated by its depth, flange width, and weight per foot
(e.g., W12x22)?
, 4|Page
A. American Standard Beam (S-shape)
B. Wide Flange Beam (W-shape)
C. Channel (C-shape)
D. Angle (L-shape)
CORRECT ANSWER: B
EXPERT RATIONALE: Wide flange shapes, designated with a "W," have inner and outer
flange surfaces that are parallel, making them ideal for beam-to-column connections.
The nomenclature describes the nominal depth and weight.
QUESTION 8
Before each use, a wire rope sling must be inspected for all of the following EXCEPT:
A. Kinking, crushing, or bird-caging.
B. The manufacturer's date of manufacture stamp.
C. Severe corrosion or broken wires.
D. End fittings that are cracked or deformed.
CORRECT ANSWER: B
EXPERT RATIONALE: While the manufacturer's date is part of the sling's record, it is
not a condition-based criterion for the "before each use" inspection, which focuses on
visible damage and wear that could compromise safety.
QUESTION 9
In bolted steel connections, what does the term "slip-critical" mean?
A. The connection is designed to allow for thermal expansion.
B. The bolts are installed in holes slightly larger than the bolt diameter.
C. The connection transfers load through friction between the connected plates.
D. The bolts are expected to fail first in an overload situation.
CORRECT ANSWER: C
EXPERT RATIONALE: In slip-critical connections, bolts are tensioned to create a high
clamping force. The load is then transferred by the friction between the faying
surfaces, not by bearing on the bolt shank.
New Mexico (NM) GS-24 Structural Steel
Erection Exam | Latest Verified Questions
and Detailed Answers
OVERVIEW DESCRIPTION:
This comprehensive collection of 300 multiple-choice questions is designed to thoroughly
prepare candidates for the New Mexico GS-24 Structural Steel Erection Exam. The questions are
meticulously crafted to cover all major aspects of the trade, including the identification and
properties of steel materials, standard shapes and profiles, and corrosion protection methods. A
significant portion focuses on critical rigging principles, equipment inspection, and load
calculations. The set also delves into the core practices of steel erection, such as structural
assembly, bolting and welding connections, and the installation of bracing and decking. Finally,
it rigorously addresses essential safety protocols, from the proper use of personal protective
equipment (PPE) to the identification and mitigation of site-specific hazards. Each question is
presented with the correct answer and a concise expert rationale to reinforce learning and clarify
industry best practices, aligning with both OSHA standards and the specific requirements of the
New Mexico exam.
NM GS-24 Structural Steel Erection Exam Practice Questions
QUESTION 1
Which ASTM specification is most commonly specified for W-shapes (wide flange
beams) in building construction due to its optimized strength-to-weight ratio and
weldability?
A. ASTM A36
B. ASTM A572
C. ASTM A992
D. ASTM A514
CORRECT ANSWER: C
EXPERT RATIONALE: ASTM A992 is the preferred material for W-shapes as it offers a
,2|Page
50 ksi minimum yield strength and a maximum yield-to-tensile ratio, ensuring good
ductility and weldability for seismic applications.
QUESTION 2
What is the primary purpose of applying a galvanized coating to structural steel?
A. To increase the tensile strength of the steel.
B. To provide a smooth surface for painting.
C. To prevent corrosion through sacrificial protection.
D. To improve the steel's ductility during erection.
CORRECT ANSWER: C
EXPERT RATIONALE: Galvanization applies a layer of zinc, which acts as a barrier and
a sacrificial anode, corroding in place of the underlying steel to protect it from rust.
QUESTION 3
When rigging a steel beam for a lift, what is the function of a spreader bar?
A. To connect the beam to the crane hook.
B. To shorten the length of the slings.
C. To minimize horizontal compression forces on the beam.
D. To equalize the load between two cranes.
CORRECT ANSWER: C
EXPERT RATIONALE: A spreader bar converts angulated sling forces into vertical
compression, preventing the beam from being crushed or bent by the inward pull of
the slings during the lift.
QUESTION 4
According to OSHA, what is the minimum required distance for cranes operating near
power lines rated 50 kV or below?
A. 5 feet
B. 10 feet
C. 15 feet
D. 20 feet
,3|Page
CORRECT ANSWER: B
EXPERT RATIONALE: OSHA regulation 1926.1408 requires a minimum clearance of 10
feet for power lines rated 50 kV or below to prevent electrocution.
QUESTION 5
What is the primary reason for installing temporary guy wires or braces during steel
column erection?
A. To provide a grounding path for lightning.
B. To support the dead load of the column before connections are made.
C. To maintain stability and plumbness until permanent connections are complete.
D. To serve as a attachment point for hoisting lines.
CORRECT ANSWER: C
EXPERT RATIONALE: Temporary bracing is critical to stabilize columns and beams
against wind, seismic forces, or accidental impacts during the erection process,
ensuring the structural frame's stability until it is self-supporting.
QUESTION 6
The property of steel that allows it to bend, twist, or elongate significantly before
fracturing is known as:
A. Tensile strength.
B. Yield strength.
C. Ductility.
D. Hardness.
CORRECT ANSWER: C
EXPERT RATIONALE: Ductility is the ability of a material to undergo plastic deformation
under tensile load before rupture. This is a vital safety feature, giving warning before
failure and allowing for force redistribution.
QUESTION 7
Which type of steel shape is designated by its depth, flange width, and weight per foot
(e.g., W12x22)?
, 4|Page
A. American Standard Beam (S-shape)
B. Wide Flange Beam (W-shape)
C. Channel (C-shape)
D. Angle (L-shape)
CORRECT ANSWER: B
EXPERT RATIONALE: Wide flange shapes, designated with a "W," have inner and outer
flange surfaces that are parallel, making them ideal for beam-to-column connections.
The nomenclature describes the nominal depth and weight.
QUESTION 8
Before each use, a wire rope sling must be inspected for all of the following EXCEPT:
A. Kinking, crushing, or bird-caging.
B. The manufacturer's date of manufacture stamp.
C. Severe corrosion or broken wires.
D. End fittings that are cracked or deformed.
CORRECT ANSWER: B
EXPERT RATIONALE: While the manufacturer's date is part of the sling's record, it is
not a condition-based criterion for the "before each use" inspection, which focuses on
visible damage and wear that could compromise safety.
QUESTION 9
In bolted steel connections, what does the term "slip-critical" mean?
A. The connection is designed to allow for thermal expansion.
B. The bolts are installed in holes slightly larger than the bolt diameter.
C. The connection transfers load through friction between the connected plates.
D. The bolts are expected to fail first in an overload situation.
CORRECT ANSWER: C
EXPERT RATIONALE: In slip-critical connections, bolts are tensioned to create a high
clamping force. The load is then transferred by the friction between the faying
surfaces, not by bearing on the bolt shank.
