CM 2500 / CM 2501 Structural Principles &
Practices Final Exam Part 2 (Module 7: Beam
Design) – LSU Kirby Hebert Practice
Questions & Answers Study Guide PDF
• This study guide contains 300 practice questions covering Module 7: Beam Design
for CM 2500/CM 2501 Structural Principles & Practices at LSU under Kirby Hebert —
work through each question independently before checking the highlighted correct
answer and EXPERT RATIONALE to reinforce your understanding.
• Each question includes 5 options (A–E), a bolded correct answer, and a EXPERT
RATIONALE — use this material for active recall practice, timed mock exams, or
topic-by-topic review sessions before your final.
QUESTION 1
What is the primary function of a beam in a structural system?
A) To transfer lateral loads to the foundation
B) To resist compressive axial forces along its length
C) To carry transverse loads and transfer them as shear and bending to
supports
D) To provide torsional resistance to the floor system
E) To act as a tension member in a truss system
Correct Answer: C
EXPERT RATIONALE: A beam's primary role is to resist transverse
(perpendicular) loads through internal shear forces and bending moments,
transferring those forces to its supports.
QUESTION 2
Which of the following best describes a simply supported beam?
A) A beam fixed at both ends with no rotation allowed
,B) A beam cantilevered from a wall with a free end
C) A beam supported at both ends allowing rotation but preventing vertical
movement
D) A beam continuous over three or more supports
E) A beam supported only at its midpoint
Correct Answer: C
EXPERT RATIONALE: A simply supported beam rests on two supports that allow
rotation (moment = 0 at supports) but prevent vertical displacement, making it the
most basic and common beam configuration.
QUESTION 3
What does the term "span" refer to in beam design?
A) The depth of the beam cross-section
B) The total load applied to the beam
C) The distance between the beam's supports
D) The width of the beam flange
E) The length of the overhang past a support
Correct Answer: C
EXPERT RATIONALE: Span is the clear or center-to-center distance between
supports. It is a critical dimension because bending moment increases with the
square of the span.
QUESTION 4
A uniformly distributed load (UDL) on a simply supported beam produces
maximum bending moment at:
A) Both support ends
,B) One-third of the span from either end
C) Midspan
D) The quarter points of the span
E) The location of the first concentrated load
Correct Answer: C
EXPERT RATIONALE: For a simply supported beam with a UDL, the bending
moment diagram is parabolic and reaches its peak value at the center (midspan),
calculated as M = wL²/8.
QUESTION 5
The formula for maximum bending moment in a simply supported beam with
a UDL is:
A) M = wL/4
B) M = wL²/4
C) M = wL²/8
D) M = wL/8
E) M = wL²/2
Correct Answer: C
EXPERT RATIONALE: For a simply supported beam with a uniformly distributed
load w over span L, the maximum moment at midspan is M = wL²/8. This is one of
the most fundamental beam design formulas.
QUESTION 6
The formula for maximum bending moment in a simply supported beam with
a single point load at midspan is:
A) M = PL/8
, B) M = PL/2
C) M = PL/4
D) M = PL/3
E) M = 2PL/3
Correct Answer: C
EXPERT RATIONALE: For a point load P at the center of a simply supported
beam of span L, the maximum bending moment is M = PL/4, occurring at the point
of load application.
QUESTION 7
Which of the following is the correct unit for bending moment?
A) Newtons (N)
B) Pascals (Pa)
C) Newton-meters (N·m) or foot-pounds (ft·lb)
D) Meters per second (m/s)
E) Kilonewtons per meter (kN/m)
Correct Answer: C
EXPERT RATIONALE: Bending moment is a force multiplied by a distance, so its
units are force × length — Newton-meters (N·m) in SI or foot-pounds (ft·lb) in
imperial units.
QUESTION 8
What is the section modulus (S) of a beam used to calculate?
A) Shear stress at the neutral axis
B) Deflection at midspan
Practices Final Exam Part 2 (Module 7: Beam
Design) – LSU Kirby Hebert Practice
Questions & Answers Study Guide PDF
• This study guide contains 300 practice questions covering Module 7: Beam Design
for CM 2500/CM 2501 Structural Principles & Practices at LSU under Kirby Hebert —
work through each question independently before checking the highlighted correct
answer and EXPERT RATIONALE to reinforce your understanding.
• Each question includes 5 options (A–E), a bolded correct answer, and a EXPERT
RATIONALE — use this material for active recall practice, timed mock exams, or
topic-by-topic review sessions before your final.
QUESTION 1
What is the primary function of a beam in a structural system?
A) To transfer lateral loads to the foundation
B) To resist compressive axial forces along its length
C) To carry transverse loads and transfer them as shear and bending to
supports
D) To provide torsional resistance to the floor system
E) To act as a tension member in a truss system
Correct Answer: C
EXPERT RATIONALE: A beam's primary role is to resist transverse
(perpendicular) loads through internal shear forces and bending moments,
transferring those forces to its supports.
QUESTION 2
Which of the following best describes a simply supported beam?
A) A beam fixed at both ends with no rotation allowed
,B) A beam cantilevered from a wall with a free end
C) A beam supported at both ends allowing rotation but preventing vertical
movement
D) A beam continuous over three or more supports
E) A beam supported only at its midpoint
Correct Answer: C
EXPERT RATIONALE: A simply supported beam rests on two supports that allow
rotation (moment = 0 at supports) but prevent vertical displacement, making it the
most basic and common beam configuration.
QUESTION 3
What does the term "span" refer to in beam design?
A) The depth of the beam cross-section
B) The total load applied to the beam
C) The distance between the beam's supports
D) The width of the beam flange
E) The length of the overhang past a support
Correct Answer: C
EXPERT RATIONALE: Span is the clear or center-to-center distance between
supports. It is a critical dimension because bending moment increases with the
square of the span.
QUESTION 4
A uniformly distributed load (UDL) on a simply supported beam produces
maximum bending moment at:
A) Both support ends
,B) One-third of the span from either end
C) Midspan
D) The quarter points of the span
E) The location of the first concentrated load
Correct Answer: C
EXPERT RATIONALE: For a simply supported beam with a UDL, the bending
moment diagram is parabolic and reaches its peak value at the center (midspan),
calculated as M = wL²/8.
QUESTION 5
The formula for maximum bending moment in a simply supported beam with
a UDL is:
A) M = wL/4
B) M = wL²/4
C) M = wL²/8
D) M = wL/8
E) M = wL²/2
Correct Answer: C
EXPERT RATIONALE: For a simply supported beam with a uniformly distributed
load w over span L, the maximum moment at midspan is M = wL²/8. This is one of
the most fundamental beam design formulas.
QUESTION 6
The formula for maximum bending moment in a simply supported beam with
a single point load at midspan is:
A) M = PL/8
, B) M = PL/2
C) M = PL/4
D) M = PL/3
E) M = 2PL/3
Correct Answer: C
EXPERT RATIONALE: For a point load P at the center of a simply supported
beam of span L, the maximum bending moment is M = PL/4, occurring at the point
of load application.
QUESTION 7
Which of the following is the correct unit for bending moment?
A) Newtons (N)
B) Pascals (Pa)
C) Newton-meters (N·m) or foot-pounds (ft·lb)
D) Meters per second (m/s)
E) Kilonewtons per meter (kN/m)
Correct Answer: C
EXPERT RATIONALE: Bending moment is a force multiplied by a distance, so its
units are force × length — Newton-meters (N·m) in SI or foot-pounds (ft·lb) in
imperial units.
QUESTION 8
What is the section modulus (S) of a beam used to calculate?
A) Shear stress at the neutral axis
B) Deflection at midspan
