Quality Control & Inspection Flashcards
7 cards from real CDT 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
A runout tolerance on a shaft controls:
Answer: The combined effect of circularity and coaxiality errors as the part rotates about a datum axis
Runout (circular or total) measures how much a surface deviates from perfect rotation about a datum axis, capturing both form and location errors simultaneously.
When checking a weld symbol on a drawing, the reference line with a tail indicates:
Answer: A specification, process, or other reference document applies to the weld
Per AWS A2.4, a tail on the weld symbol reference line is used to designate welding process, specification, or other supplementary information.
A QC inspection plan requires sampling 5% of parts from a production run. If 2,000 parts are produced and 8 defects are found in the sample, the estimated defect rate for the full run is:
Answer: 8%
5% of 2,000 = 100 parts sampled; 8 defects in 100 parts = 8% sample defect rate, projecting approximately 8% (160 defects) across the full production run.
Which type of section view is used when the cutting plane passes through offset features that are not in a straight line?
Answer: Offset section
An offset section view uses a stepped cutting plane that bends to pass through multiple features that are not collinear, revealing all features in one view.
Under ASME Y14.5, the 'rule #1' (envelope principle) states that:
Answer: A feature of size must not violate its envelope of perfect form at maximum material condition
Rule #1 (Taylor principle) requires that the surface of an individual feature of size must not exceed a boundary of perfect form at MMC.
A drawing QC reviewer finds that a detail view is labeled 'DETAIL A' but the corresponding circle and leader on the parent view are missing. The reviewer should:
Answer: Flag the missing parent-view callout as an error requiring correction before release
Every detail view must have a corresponding identification circle with leader and matching label on the parent view to maintain drawing traceability.
A concentricity tolerance differs from a runout tolerance in that concentricity:
Answer: Controls the median points of a diametric feature relative to a datum axis, not the surface
Concentricity controls the location of the derived median points of a cylindrical feature relative to a datum axis, whereas runout measures the actual surface as the part rotates.