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

4 feet

Answer

10 feet

Answer

8 feet

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

Shear from the footing toe

Answer

Lateral pile loads

Answer

Frost-heave uplift only

Question 3

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

Accepted Answer

0.013

Answer

0.025

Answer

0.035

Answer

0.050

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

Early Start (ES) plus activity duration

Answer

Late Finish (LF) plus total float

Answer

Early Finish (EF) minus free float

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

K0 = sin φ'

Answer

K0 = cos²φ'

Answer

K0 = tan²(45 + φ'/2)

Question 6

A highway vertical curve connects a +3% grade with a −2% grade. The algebraic difference in grades (A) is:

Accepted Answer

5%

Answer

1%

Answer

−5%

Answer

2%

Question 7

The purpose of a dewatering system during deep excavation is to:

Accepted Answer

Lower the groundwater table to prevent seepage, heave, and instability

Answer

Remove surface runoff only

Answer

Increase soil bearing capacity permanently

Answer

Prevent frost penetration