FE Civil Engineering Exam Prep #4

Question 1

What is the total volume of a grit chamber designed to handle an average daily flow of 3 million gallons with a peak flow ratio of 2.5, and a detention time of 3 minutes?

Accepted Answer

2,079 ft3

Answer

First, calculate the peak flow rate: 3 million gallons/day * 2.5 (peak ratio) = 7.5 million gallons/day. Convert this to ft³/min: (7.5 * 10^6 gallons/day) * (1 day / 1440 min) * (1 ft³ / 7.48 gallons) ≈ 695 ft³/min. Then, multiply by the detention time: 695 ft³/min * 3 min = 2085 ft³. The closest answer is 2,079 ft³.

Question 2

Which of the following is a potential safety or operational issue associated with a bridge spanning a recently repaved roadway that now has a vertical clearance of 4-inches less than posted?

Accepted Answer

All of the above

Answer

A reduction in vertical clearance under a bridge, especially if unposted, poses several serious safety and operational issues. Over-height vehicles can collide with the bridge structure, causing damage to both the vehicle and the bridge. Such collisions can lead to multiple vehicle crashes due to debris or sudden stops, and the resulting accidents or bridge closures can cause significant traffic delays.

Question 3

When considering the surface overflow rates of primary settling tanks in a typical municipal wastewater treatment plant, which of the following statements is not correct?

Accepted Answer

Sizing is based on measured flow conditions

Answer

While measured flow conditions are certainly considered, the statement 'Sizing is based on measured flow conditions' is not entirely correct as a sole determinant. Primary settling tanks are typically sized based on *design* flow rates (average and peak) and desired surface overflow rates, which are established criteria for effective solids removal, not solely on *measured* flow conditions which can fluctuate. The other options correctly describe considerations for primary settling tank design.

Question 4

Cathodic protection is used to control which of the following?

Accepted Answer

Corrosion

Answer

Cathodic protection is an electrochemical technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell. This method is commonly applied to pipelines, storage tanks, and other metallic structures exposed to corrosive environments, preventing the degradation of the material and extending its lifespan.

Question 5

When consuming drinking treated water, which of the following may be an indicator of water quality problems within a finished water storage facility?

Accepted Answer

All of the above

Answer

Poor taste, odor, and changes in water temperature can all be indicators of water quality problems within a finished water storage facility. Taste and odor issues often suggest the presence of microbial growth, chemical contamination, or stagnation. Significant temperature changes can also promote microbial activity or indicate issues with water circulation and quality degradation.

Uncategorized Practice Test

Uncategorized Practice Test

FE Civil Engineering Exam Prep #4