All Free Civil Engineering MCQs with Answers
Every Civil Engineering question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
631 questions · page 32 of 32
- A. At which the aircraft first begins its take-off roll
- B. At which the aircraft crosses the runway threshold on approach
- C. At which the aircraft leaves the taxiway for the apron
- D. At which the aircraft reaches its cruising altitude
Explanation: Threshold speed refers to the aircraft speed as it crosses the runway threshold during the approach or landing sequence.
Correct answer: At which the aircraft crosses the runway threshold on approach622. In highway pavement design, the term ESAL represents the cumulative effect of traffic expressed as:
- A. Effective surface aggregate loss
- B. Estimated seasonal axle loading
- C. Equivalent standard axle load repetitions
- D. Equivalent subgrade allowable length
Explanation: ESAL means equivalent standard axle load repetitions. Different axle loads are converted to an equivalent number of applications of a…
Correct answer: Equivalent standard axle load repetitions- A. Withstand abrasive wear
- B. Harden under impact
- C. Resist water absorption
- D. Stretch before breaking
Explanation: Ductility is the distance bitumen can elongate before it breaks under specified conditions.
Correct answer: Stretch before breaking- A. Rutting
- B. Ravelling
- C. Bleeding
- D. Polishing
Explanation: Rutting consists of permanent longitudinal depressions in the wheel tracks, usually caused by accumulated deformation in the asphalt…
Correct answer: Rutting- A. Provide decorative surface texture
- B. Reduce pumping and provide uniform support
- C. Replace the need for concrete joints
- D. Increase tyre-pavement friction alone
Explanation: A subbase provides more uniform support and helps control pumping of water and soil fines through pavement joints.
Correct answer: Reduce pumping and provide uniform support- A. Drainage gradient
- B. Pavement skid resistance
- C. Overtaking or stopping sight distance
- D. Railway cant deficiency
Explanation: Crest vertical curves must provide sufficient visibility over the summit.
Correct answer: Overtaking or stopping sight distance- A. A completely empty network
- B. Only free-flow speed conditions
- C. The highest possible tyre pressure
- D. Specified prevailing roadway and traffic conditions
Explanation: Capacity is the maximum sustainable flow under specified roadway, traffic and control conditions.
Correct answer: Specified prevailing roadway and traffic conditions- A. A significant reduction in operating speed
- B. A permanent increase in lane width
- C. A reduction in vehicle dimensions
- D. An increase in pavement thickness
Explanation: Unstable flow occurs near or beyond capacity, where a small demand increase can produce a sharp speed reduction and congestion.
Correct answer: A significant reduction in operating speed- A. Length in hundreds of metres
- B. Magnetic azimuth rounded to the nearest ten degrees
- C. Width in metres multiplied by two
- D. Elevation above mean sea level
Explanation: A runway designation normally uses its magnetic heading rounded to the nearest 10 degrees, with the last digit omitted.
Correct answer: Magnetic azimuth rounded to the nearest ten degrees- A. Vertical bending between sleepers
- B. Lateral widening of gauge
- C. Longitudinal movement along the track
- D. Corrosion beneath the head
Explanation: Rail creep is the gradual longitudinal movement of rails, often in the direction of predominant train movement.
Correct answer: Longitudinal movement along the track- A. Reduction in runway visibility
- B. Loss of concrete strength at joints
- C. Increase in railway gauge
- D. Excessive lateral movement or overturning of slow vehicles
Explanation: Excessive superelevation can cause slow-moving vehicles to slide inward or become unstable when they travel below the design speed.
Correct answer: Excessive lateral movement or overturning of slow vehicles