Bachelor of Civil Engineering Flashcards
7 cards from real BE/B Eng Bachelor of Engineering practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Bachelor of Civil Engineering flashcards as text
In wastewater treatment, the Biochemical Oxygen Demand (BOD) test measures:
Answer: The oxygen consumed by microorganisms decomposing organic matter over 5 days at 20°C
BOD5 quantifies the amount of dissolved oxygen consumed by biological degradation of organic pollutants at 20°C over five days.
The effective length factor (K) for a column with both ends pinned is:
Answer: 1.0
A pin-pin column buckles in a half-sine wave with an effective length equal to its actual length, giving K = 1.0.
Which method is used to determine the California Bearing Ratio (CBR) of a subgrade soil?
Answer: A penetration test comparing resistance to that of crushed limestone
CBR is determined by measuring the load required to penetrate a soil sample at specified rates compared to standard crushed limestone values.
In open-channel hydraulics, critical flow occurs when the Froude number (Fr) equals:
Answer: 1.0
Critical flow is defined by Fr = V/√(gD) = 1, where inertial and gravitational forces are equal and specific energy is minimized for a given discharge.
The primary advantage of using fiber-reinforced polymer (FRP) composites in civil structures is:
Answer: High strength-to-weight ratio and corrosion resistance
FRP composites offer very high tensile strength at low weight and are immune to corrosion, making them ideal for harsh environments.
In a two-way slab system, the Direct Design Method (ACI 318) can be applied only when:
Answer: There are at least three continuous spans in each direction and the ratio of longer to shorter span ≤ 2
ACI 318's Direct Design Method requires ≥3 spans each way, span aspect ratio ≤ 2, and live load ≤ 2× dead load among other conditions.
Which type of contract delivery method gives the owner the highest degree of design control but typically the longest project schedule?
Answer: Design-Bid-Build (DBB)
Design-Bid-Build is sequential — design must be fully complete before bidding and construction begin — giving owners full design control but the longest timeline.