Quality Control & Inspection Flashcards
7 cards from real CFB practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Quality Control & Inspection flashcards as text
Which non-destructive testing method uses high-frequency sound waves to detect internal flaws in structural steel welds?
Answer: Ultrasonic testing (UT)
Ultrasonic testing (UT) transmits sound waves through material and detects internal discontinuities by analyzing reflected signals, making it ideal for subsurface weld defects.
What is the minimum curing period for normal-weight concrete flatwork to achieve adequate strength gain before removing forms, according to ACI 308?
Answer: 7 days minimum for most applications
ACI 308 recommends a minimum 7-day moist curing period for most concrete flatwork using Type I/II cement to ensure adequate early-age strength development.
During roofing installation, a field inspector observes that membrane laps are only 2 inches wide instead of the specified 3 inches. This deficiency primarily risks:
Answer: Water infiltration at the seam under wind-driven rain
Insufficient lap width reduces the seam bond length, making it prone to separation and allowing water to infiltrate the building envelope during rain events.
A field builder reviewing reinforcing steel placement finds the bottom mat in a slab has 3/4-inch cover instead of the specified 1.5-inch clear cover. The BEST course of action is:
Answer: Reject and require repositioning to meet specification before concrete placement
Insufficient cover reduces corrosion protection and fire resistance; reinforcing must be repositioned to meet the specified cover before concrete is placed.
What does a pull-out test on a post-installed anchor evaluate?
Answer: The installed anchor's load capacity in tension within the base material
A pull-out test applies a measured tensile load to a post-installed anchor to verify that it achieves the required holding strength in the substrate.
When inspecting gypsum board (drywall) installation, which fastener condition requires rejection?
Answer: Fastener heads that have broken through the paper face
Fasteners that break through the gypsum board paper face lose their holding capacity and must be rejected and replaced with new fasteners nearby.
Which of the following is the correct sequence for a field quality inspection of a welded steel connection?
Answer: Preheat check → welding → cleaning → visual inspection → NDT if required
The correct sequence ensures preheat is verified before welding, the weld is cleaned after welding, and visual inspection followed by NDT confirms weld quality.