CDT Quality Control & Inspection 2 — Questions and Answers
Question 1: When performing a dimensional check on a mechanical drawing, which tool is most appropriate for measuring an internal bore diameter to a tolerance of ±0.001 inch?
- Steel rule
- Vernier caliper
- Bore micrometer (Correct answer)
- Depth gauge
Correct answer: Bore micrometer
A bore micrometer provides the precision needed to measure internal diameters to within ±0.001 inch accuracy.
Question 2: A drawing checker finds that a title block lists 'SCALE: 1:2' but a dimension on the drawing does not match the scaled geometry. What is the correct QC action?
- Change the scale notation to match the geometry
- Flag a dimension-to-geometry discrepancy for the originator to resolve (Correct answer)
- Redraw the geometry to match the dimension
- Remove the scale notation
Correct answer: Flag a dimension-to-geometry discrepancy for the originator to resolve
A discrepancy between annotated dimensions and drawn geometry must be flagged to the originator, as the intent may be in either place.
Question 3: Which ASME standard governs the checking and interpretation of geometric dimensioning and tolerancing (GD&T) on engineering drawings?
- ASME B46.1
- ASME Y14.5 (Correct answer)
- ASME B4.1
- ASME Y14.100
Correct answer: ASME Y14.5
ASME Y14.5 is the standard that defines GD&T symbols, rules, and their interpretation on engineering drawings.
Question 4: During a drawing review, an inspector notices that a flatness callout has no datum reference. This is:
- An error — all form tolerances require a datum
- Acceptable — flatness is a form tolerance and requires no datum (Correct answer)
- An error — flatness must reference at least one datum plane
- Acceptable only if the tolerance value is greater than 0.005 inch
Correct answer: Acceptable — flatness is a form tolerance and requires no datum
Flatness is a form tolerance that controls a surface unto itself and therefore requires no datum reference per ASME Y14.5.
Question 5: A redline markup on a production drawing shows a hole moved 0.25 inch. Before releasing the revision, QC must verify that:
- The hole's new position does not conflict with adjacent features or minimum edge distances (Correct answer)
- The drawing number is changed to reflect a new part
- The title block date is left unchanged
- All other dimensions are recalculated from scratch
Correct answer: The hole's new position does not conflict with adjacent features or minimum edge distances
Moving a feature requires checking for interference with nearby features, wall thickness, and minimum edge-distance requirements.
Question 6: Which type of drawing review specifically checks that all views are necessary, sufficient, and properly aligned with each other?
- Tolerance stack-up review
- View completeness and projection check (Correct answer)
- Material and finish audit
- BOM reconciliation
Correct answer: View completeness and projection check
A view completeness and projection check ensures every view shown is required, no views are missing, and orthographic alignment is correct.
Question 7: A first-article inspection (FAI) report for a machined part shows one dimension is out of tolerance. The correct next step is:
- Ship the part and note the deviation in shipping documents
- Reject the part and issue a nonconformance report (NCR) (Correct answer)
- Adjust the drawing tolerance to match the actual part
- Re-measure the part with a less accurate instrument
Correct answer: Reject the part and issue a nonconformance report (NCR)
An out-of-tolerance dimension on a FAI triggers rejection and issuance of an NCR to document the nonconformance and drive corrective action.
CDT Quality Control & Inspection 2
When performing a dimensional check on a mechanical drawing, which tool is most appropriate for measuring an internal bore diameter to a tolerance of ±0.001 inch?