ETC ETC Construction Methods & Equipment 2 — Questions and Answers
Question 1: What is the purpose of formwork in concrete construction?
- To mold and support fresh concrete until it gains sufficient strength (Correct answer)
- To reinforce the concrete after curing
- To measure concrete placement depths
- To seal construction joints
Correct answer: To mold and support fresh concrete until it gains sufficient strength
Formwork is a temporary mold that shapes fresh concrete and supports its weight until the concrete hardens enough to be self-supporting.
Question 2: What does the Proctor compaction test determine?
- The optimum moisture content and maximum dry density of a soil (Correct answer)
- The bearing capacity of compacted fill
- The shear strength of undisturbed soil
- The plasticity index of fine-grained soils
Correct answer: The optimum moisture content and maximum dry density of a soil
The Proctor test determines the relationship between moisture content and dry density, identifying the optimum moisture for maximum compaction.
Question 3: What does the rated capacity of a crane represent?
- The maximum load the crane is designed and tested to lift at a given radius (Correct answer)
- The load the crane can lift continuously without maintenance
- The combined weight of the crane and its maximum load
- The load capacity at maximum boom extension only
Correct answer: The maximum load the crane is designed and tested to lift at a given radius
Rated capacity is the manufacturer's maximum tested and certified load for the crane at a specific boom angle, radius, and configuration.
Question 4: What type of concrete admixture is used to accelerate setting time in cold weather?
- Calcium chloride or non-chloride accelerator (Correct answer)
- Air-entraining agent
- Water-reducing agent (plasticizer)
- Fly ash pozzolan
Correct answer: Calcium chloride or non-chloride accelerator
Accelerating admixtures such as calcium chloride speed up cement hydration, helping concrete gain strength faster in cold conditions.
Question 5: What is the purpose of a control joint in masonry construction?
- To allow for thermal and shrinkage movement without uncontrolled cracking (Correct answer)
- To transfer loads between masonry panels
- To anchor masonry to a backup wall
- To drain water from the wall cavity
Correct answer: To allow for thermal and shrinkage movement without uncontrolled cracking
Control joints are planned discontinuities that create a weak plane where movement cracks will occur in a predictable, manageable location.
Question 6: What equipment is used to drive steel H-piles into soil at a construction site?
- Pile driver with drop hammer or hydraulic hammer (Correct answer)
- Vibratory compactor
- Hydraulic excavator
- Casing oscillator
Correct answer: Pile driver with drop hammer or hydraulic hammer
A pile driver uses repeated impact from a drop or hydraulic hammer to force steel piles into the ground to required bearing capacity or refusal.
ETC ETC Construction Methods & Equipment 2
What is the purpose of formwork in concrete construction?