CITB Construction Methods and Materials 2

Question 1

What is the primary purpose of a vapor barrier in wall construction?

Accepted Answer

To prevent moisture migration into insulation and framing

Answer

To increase structural strength

Answer

To improve fire resistance

Answer

To reduce sound transmission

Question 2

Which type of concrete mix design has the highest water-to-cement ratio?

Accepted Answer

Lean concrete used as a mud slab

Answer

High-strength concrete

Answer

Normal structural concrete

Answer

Self-consolidating concrete

Question 3

In steel frame construction, what is the function of a shear tab connection?

Accepted Answer

To connect beams to columns while transferring shear loads

Answer

To transfer axial tension between columns

Answer

To provide moment resistance at beam-column joints

Answer

To anchor the base plate to the foundation

Question 4

What distinguishes engineered lumber products like LVL from dimensional lumber?

Accepted Answer

LVL uses veneers bonded under heat and pressure for consistent strength

Answer

LVL is made from softwood only

Answer

LVL has lower load capacity than sawn lumber

Answer

LVL must always be used in exposed exterior applications

Question 5

Which excavation method is most appropriate for installing a large-diameter water main under an active roadway?

Accepted Answer

Horizontal directional drilling (HDD)

Answer

Open-cut trenching

Answer

Caisson sinking

Answer

Sheet pile cofferdam

Question 6

What is the term for the process of gradually increasing load on a newly constructed post-tensioned concrete slab?

Accepted Answer

Propping and de-propping sequence

Answer

Preloading

Answer

Shoring removal

Answer

Backfilling

Question 7

Galvanized steel fasteners are required when connecting pressure-treated lumber primarily because:

Accepted Answer

The preservative chemicals in treated lumber corrode standard steel fasteners

Answer

They are cheaper than stainless steel

Answer

They provide better shear resistance

Answer

Pressure-treated wood expands more than untreated wood