Civil Engineering PE Basic Civil Engineering PE 5

Question 1

In a soil consolidation test, the time to reach 50% consolidation (t_50) is 10 minutes for a 1-inch thick doubly drained sample. What is the coefficient of consolidation c_v?

Accepted Answer

0.0197 in²/min

Answer

0.00197 in²/min

Answer

0.197 in²/min

Answer

1.97 in²/min

Question 2

Which type of prestressed concrete system applies prestress after the concrete has hardened and reached adequate strength?

Accepted Answer

Post-tensioned

Answer

Pre-tensioned

Answer

Partially prestressed

Answer

Pretensioned with debonding

Question 3

The design flood for a major highway culvert crossing typically corresponds to which return period?

Accepted Answer

100-year

Answer

10-year

Answer

25-year

Answer

50-year

Question 4

In a CPM schedule, if Activity A has an Early Start (ES) of Day 5, an Early Finish (EF) of Day 12, a Late Finish (LF) of Day 15, the total float is:

Accepted Answer

3 days

Answer

0 days

Answer

7 days

Answer

10 days

Question 5

In wastewater treatment, the Biochemical Oxygen Demand (BOD) test measures:

Accepted Answer

Oxygen required by bacteria to decompose organic matter

Answer

Total dissolved solids in effluent

Answer

Chemical oxygen demand from inorganic compounds

Answer

Turbidity of the wastewater

Question 6

A 12-inch diameter concrete pipe flows full with Manning's n = 0.013 and slope S = 0.005. The approximate full-flow discharge Q is:

Accepted Answer

1.70 cfs

Answer

0.85 cfs

Answer

3.40 cfs

Answer

0.43 cfs

Question 7

Which factor does NOT affect the lateral earth pressure coefficient at rest (K_0) for a normally consolidated soil?

Accepted Answer

Depth of soil layer

Answer

Friction angle (φ')

Answer

Overconsolidation ratio (OCR)

Answer

Poisson's ratio (ν)