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| Section | Weight | Objectives |
|---|---|---|
| Structural Design Fundamentals | 20% | - Structural analysis
|
| Municipal Engineering | 20% | - Water supply and distribution
|
| Surveying | 20% | - Measurement and calculation techniques
|
| Materials Testing | 20% | - Concrete and asphalt testing
|
| Transportation Engineering | 20% | - Traffic engineering
|
>> Civil-Engineering-Technology Testengine <<
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44. Frage
What substance is used to calibrate a concrete air pressure meter?
Antwort: A
Begründung:
A pressure air meter (used to measure air content of fresh concrete) must be calibrated by verifying thevolume of the measuring bowl and theaccuracy of the graduated neck/markings. This is done usingwaterbecause water volume can be measured accurately and used to check the meter's indicated graduations (air content scale) by filling the assembled unit to known levels. InExperiment Design for Civil Engineering, the calibration procedure directs filling the assembled air meterwith waterto the highest graduation mark and adding water in known increments to verify that the graduations are accurate throughout the range. The same source references using water to establish the mass/density) and to check calibration cups and neck readings.
Therefore, the substance used to calibrate the air pres*, makingOption Bcorrect.
45. Frage
If a controlled product is used, stored, handled, or manufactured at a work site, what documents should be discussed at safety meetings with workers?
Antwort: A
Begründung:
Controlled products (hazardous products) require workers to understand the hazards, safe handling, storage, PPE, first aid, spill response, and emergency measures. The document that communicates this hazard and control information for each product is theMaterial Safety Data Sheet (MSDS)(now commonly SDS under GHS, but MSDS remains widely referenced in training/exams). Safety systems require that these sheets be readily accessible and that workers be informed/trained on the hazards and controls associated with the products they use. EM 385-1-1 requires hazard communication, including that hazardous chemical information be available and communicated to personnel, and that safety meetings/training address hazard controls and safe work practices. In the WHMIS framework, WHMIS is the overall system, while the MSDS
/SDS is the specificproduct documentdiscussed and referenced for each controlled product. Therefore, the correct choice isMaterial Safety Data Sheets (MSDS).
46. Frage
Which joints in concrete slab construction determine the location of cracks?
Antwort: D
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.
47. Frage
Which of the following images shows the appropriate tool to measure the slump of concrete?
Antwort: D
Begründung:
Concreteslumpis measured using theslump cone (Abrams cone)apparatus and tamping rod in accordance with standard procedures (e.g., ASTM C143). The test measures the vertical "settlement" of fresh concrete after a cone-shaped mold is filled in layers, consolidated (rodded), struck off, and then lifted vertically so the concrete subsides; the drop in height is the slump. TheEssentials of Civil Engineering Materialstext describes the slump test as forming a specimen inside ametal cone, removing the cone, and measuring how much the top settles ("slumps"), and it outlines the typical steps: wet the cone, fill in layers, tamp with a rod, strike off, and measure the slump. The correct tool set therefore is the image that shows theslump cone with base and tamping rod, which corresponds toOption C.
48. Frage
What test should be used to determine the compressive strength of concrete?
Antwort: C
Begründung:
Concrete compressive strength is determined by loading astandard molded specimento failure in a compression testing machine and calculating strength from the peak load divided by the specimen's cross- sectional area. The common acceptance specimen for cast-in-place concrete is acylinder, produced and cured using standardized procedures to ensure that test results reliably represent the delivered concrete. Civil engineering materials references describe compressive strength testing as the principal measure used to verify compliance with specified strength (f'c), and that cylinder specimens are tested in compression to determine the maximum stress sustained.
A slump test measures workability/consistency, an air test measures entrained air content, and sieve testing measures aggregate gradation-none of these directly measure compressive strength. Therefore, the required test for compressive strength is thecylinder test (Option B).
49. Frage
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