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| Section | Weight | Objectives |
|---|---|---|
| Structural Design Fundamentals | 20% | - Design of structural elements
|
| Municipal Engineering | 20% | - Wastewater and stormwater management
|
| Transportation Engineering | 20% | - Highway and road design
|
| Materials Testing | 20% | - Concrete and asphalt testing
|
| Surveying | 20% | - Surveying equipment and methods
|
>> Civil-Engineering-Technology Fragen Und Antworten <<
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63. Frage
A soil sample has a porosity of 40%, and the specific gravity of solids is 2.60. What would be the approximate value of dry density of the soil if the soil is completely saturated?
Antwort: B
Begründung:
For soils, porosityand void ratioare related by. With,
Dry unit weight (often called dry density in kN/m³ terms) is:
whereis specific gravity of solids and. Substituting:
Note that "completely saturated" affects thebulk/saturated unit weight, but thedryunit weight depends only on the solids content (via) and void structure (via), not on how much water occupies the voids. These phase- relationship calculations are standard in soil mechanics.
64. Frage
A civil engineering technologist is completing quality control for a municipal design. When checking design calculations, the technologist notices errors in the design and final design drawings made by a senior structural engineer. The technologist suspects that the errors may result in the failure of a suspended slab/roof car parking area. What should be the primary consideration in this situation?
Antwort: B
Begründung:
Engineering ethics and professional duty prioritizepublic protectionover hierarchy, convenience, or reputational concerns. Civil engineering ethics guidance explicitly states that engineers shallhold paramount the safety, health, and welfare of the public, and that when professional judgment is overruled under circumstances endangering public welfare, the engineer is expected to notify the client or appropriate authority. This principle is repeated in civil engineering professional canons (e.g., ASCE Fundamental Canon
1) and is treated as the primary criterion even when it conflicts with other pressures. In this scenario, suspected structural failure risk for a public parking slab/roof is a direct life-safety concern; therefore the technologist's primary consideration must be ensuring the issue is elevated and addressed to prevent unsafe construction or operation. Other factors (seniority, conflict disclosure, competence) may be relevant in process, but none outweigh the overriding requirement to protect the public. Hence,Option Cis correct.
65. Frage
The k-value in a vertical curve design defines the horizontal distance required to make a 1% change in the gradient. Provided that the stopping sight distance is the same, the uphill grade is 1%, the downhill grade is #0.
5%, and the design speed is 90 km/h, what is the length of the vertical curve?
Antwort: A
Begründung:
For vertical curves, AASHTO uses theK valuedefined as, whereis curve length (m) andis the algebraic difference in grades (percent). Here,and, so. Withstopping sight distance controlled by the same criterion(i.
e., the applicable K value for the given design speed remains the same), length is found from. For 90 km/h, the SSD-based K for the controlling curve type yieldsthat corresponds to60 mforper the provided choices.
This reflects standard vertical-curve practice: once K is set by SSD for the design speed, length scales linearly with the grade difference.
66. Frage
Considering Occupational Health and Safety standards for trench side slopes in lieu of shoring, and a 1.2 m wide trench, what is the minimum offset from centre line to the top edge of the trench for an excavation that is
3 m deep?
Antwort: A
Begründung:
For trenches without shoring, OHS/OSHA sloping requirements depend on soil type; when soil is not specified, standard practice is to use themost conservative allowable slope(Type C), which is1.5H:1Vfor excavations less than 20 ft (#6 m) deep. Lindeburg's reference (citing OSHA 1926 Subpart P, App. B) provides maximum allowable slopes, includingType C = 1.5:1 (H:V). For a 3 m deep trench, horizontal run on each side = 1.5 × 3 =4.5 m. Trench bottom width is 1.2 m, so half-width from centreline =0.6 m. Minimum offset from centreline to top edge = 0.6 + 4.5 =5.1 m, which rounds to the available option5.20 m. Therefore,D is the correct answer.
67. Frage
Which joints in concrete slab construction determine the location of cracks?
Antwort: A
Begründung:
Concrete slabs shrink as they cure and experience temperature/moisture changes. Because the slab is restrained by subbase friction and adjacent elements, tensile stresses develop and cracking is likely unless the slab is intentionally "weakened" at planned locations.Control joints(also called contraction joints) are formed or saw-cut to create a deliberate plane of weakness so that shrinkage cracking occurswhere intended, producing straighter, serviceable cracks that are easier to seal and maintain. Technical references describe contraction/control joints as placed at regular intervals specifically tocontrol random crackingby encouraging the crack to form along the joint line, relieving tensile stresses in the slab. Expansion joints address thermal expansion, isolation joints separate the slab from fixed elements, and construction joints occur where placements stop and start; none of those are primarily intended tocontrol crack locationthe way control joints are. Therefore, the joint type that determines where cracks occur is thecontrol joint.
68. Frage
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