NCEES Structural Engineering 2 — Questions and Answers
Question 1: For the NCEES PE Structural exam, the modulus of elasticity for structural steel per AISC is:
- 25,000 ksi
- 29,000 ksi (Correct answer)
- 57,000 ksi
- 33,000 ksi
Correct answer: 29,000 ksi
AISC specifies E = 29,000 ksi (approximately 200 GPa) for structural steel.
Question 2: In NCEES PE Structural practice, shear lag in a bolted tension member is accounted for by applying which reduction factor?
- Phi factor φ
- Reduction factor U (Correct answer)
- Buckling coefficient Ks
- Safety factor Ω
Correct answer: Reduction factor U
The shear lag factor U reduces the net effective area of a tension member when not all elements are connected.
Question 3: A continuous beam is more efficient than a simply supported beam of the same span primarily because:
- It eliminates shear forces entirely
- Negative moments at supports reduce the maximum positive moment (Correct answer)
- It has a higher moment of inertia
- The material strength is higher at supports
Correct answer: Negative moments at supports reduce the maximum positive moment
Continuity generates negative moments at supports that reduce midspan positive moment, allowing a shallower or lighter section.
Question 4: In NCEES structural design, the design tensile strength of a bolt in bearing-type connection per AISC LRFD is φRn, where φ equals:
- 0.90
- 0.75 (Correct answer)
- 0.85
- 0.65
Correct answer: 0.75
For bolt tension rupture, AISC LRFD uses φ = 0.75 applied to the nominal tensile strength.
Question 5: According to ACI 318 as tested on the NCEES PE exam, the minimum flexural steel ratio ρ_min for rectangular beams is approximately:
- 0.005
- 200/fy (Correct answer)
- 0.85β₁
- 0.75ρ_balanced
Correct answer: 200/fy
ACI 318 requires ρ_min = max(3√f'c/fy, 200/fy) to prevent brittle failure in lightly reinforced beams.
Question 6: In the NCEES PE Structural exam, which section property is most critical for predicting deflection in a beam?
- Section modulus S
- Moment of inertia I (Correct answer)
- Plastic section modulus Z
- Radius of gyration r
Correct answer: Moment of inertia I
Deflection is inversely proportional to EI; the moment of inertia I directly governs bending stiffness.
For the NCEES PE Structural exam, the modulus of elasticity for structural steel per AISC is: