Civil Engineering PE Prep 5

Question 1

The OSHA standard for fall protection in construction requires guardrails or other protection when workers are exposed to a fall hazard of at least:

Accepted Answer

6 feet

Answer

OSHA 29 CFR 1926.502 requires fall protection for construction workers at 6 feet above a lower level.

Question 2

A cantilever retaining wall has a heel slab that is designed primarily to resist:

Accepted Answer

Overturning moment and provide base resistance using soil weight above the heel

Answer

The heel slab extends under the retained fill so that soil weight above it contributes to overturning resistance.

Question 3

Manning's roughness coefficient (n) for a smooth concrete open channel is typically about:

Accepted Answer

0.013

Answer

Smooth formed concrete typically has n ≈ 0.013 in Manning's equation for open channel flow.

Question 4

In a CPM network, the Late Start (LS) of an activity is computed as:

Accepted Answer

Late Finish (LF) minus activity duration

Answer

LS = LF − duration; this is the backward-pass calculation in CPM scheduling.

Question 5

In soil mechanics, the coefficient of lateral earth pressure at rest (K0) for a normally consolidated clay is approximated by:

Accepted Answer

K0 = 1 − sin φ'

Answer

Jaky's formula K0 = 1 − sin φ' applies to normally consolidated soils.

Civil Engineering PE Practice Test