Civil Engineering Quiz
Questions: 16 · 10 minutes
1. For an open channel with unchanged slope, cross-section, and water depth, Manning's roughness coefficient increases because vegetation has grown. What is the expected effect on mean flow velocity?
It increases because vegetation concentrates the flow
It remains unchanged because only the slope controls velocity
It becomes zero for any amount of vegetation
It decreases because resistance to flow has increased
2. Why are gravity sewers typically designed with a minimum slope or equivalent hydraulic criterion?
To keep every pipe flowing completely full
To eliminate the need for access structures
To support flow velocities that limit solids deposition
To prevent any air from entering the system
3. A simply supported beam carries one concentrated load at midspan. Where does the maximum bending moment occur?
Just outside either support
At both supports
At midspan beneath the load
It is constant along the entire beam
4. A survey crew needs a reliable reference for determining the elevations of points around a construction site. What should it use?
A temporary point with an assumed horizontal bearing only
A benchmark with a known elevation
A property corner whose elevation has not been established
A ranging rod placed at the tallest visible point
5. In a basic engineering check, what does a factor of safety greater than 1 generally compare?
Dead load with the structure's total mass
Construction cost with maintenance cost
Available capacity with the corresponding demand
Design life with construction duration
6. Raw water contains fine suspended particles that settle very slowly. Which treatment sequence is commonly used to gather them into settleable masses before sedimentation?
Disinfection followed by aeration
Coagulation followed by flocculation
Screening followed by chlorination
Filtration followed by softening
7. A flexible asphalt pavement develops interconnected cracks resembling an alligator's skin within wheel paths. What does this pattern most commonly indicate?
Thermal contraction from a single cold night
Polishing of aggregate at the pavement surface
Fatigue damage associated with repeated traffic loading
Excessive road-surface cross slope
8. During earthwork, a contractor compacts fill in thin layers before testing it. What is the main engineering purpose of compaction?
To reduce voids and increase dry density
To make the soil absorb as much water as possible
To increase the soil's organic content
To convert every soil type into gravel
9. When establishing adequate stopping sight distance on a road, which two distance components are principally combined?
Passing distance and intersection clearance distance
Lane-changing distance and shoulder recovery distance
Acceleration distance and overtaking distance
Perception-reaction distance and braking distance
10. On a topographic plan, contour lines become tightly spaced along part of a proposed road route. What does this indicate?
The ground is nearly level
The location is necessarily below sea level
The soil has a high bearing capacity
The ground has a relatively steep slope
11. A column carries loads from several floors. In a complete structural load path, where should those loads ultimately be transferred?
Into the roof drainage system
Into nonstructural partition walls
Into the building's exterior cladding
Into soil or rock through the foundation
12. Why is steel reinforcement commonly placed in a reinforced-concrete beam?
To prevent concrete from undergoing any compression
To resist tensile forces that concrete handles poorly
To eliminate the need for concrete cover
To make hardened concrete completely impermeable
13. Two adjacent building columns settle by different amounts after construction. Why is this usually more concerning than equal settlement of both columns?
Differential settlement can distort and crack the structure
Equal settlement always causes immediate foundation rotation
Differential settlement automatically increases soil strength
Equal settlement creates larger internal forces in every case
14. A new road culvert crosses a stream used by aquatic organisms. Which design consideration best supports ecological connectivity?
Maintaining suitable depth, velocity, and passage through the crossing
Perching the outlet above the downstream channel bed
Replacing the natural bed with a steep, smooth surface
Maximizing outlet velocity under ordinary flow conditions
15. After heavy rain, water accumulates behind a retaining wall. What is the main purpose of properly designed weep holes or drainage media behind the wall?
To increase the unit weight of the retained soil
To relieve water pressure acting on the wall
To transfer all lateral earth pressure into the wall face
To stop the retained soil from undergoing any settlement
16. A reinforced-concrete member has inadequate cover, allowing moisture and salts to reach the steel. Why can corrosion eventually crack and spall the concrete?
Rust products expand and exert pressure on the surrounding concrete
Corrosion permanently removes all bond stress at its onset
Corrosion causes the steel to dissolve without changing the surrounding concrete
Rust causes hardened concrete to melt at normal temperatures