CDT Sectional Views & Auxiliary Views 1 — Questions and Answers
Question 1: What is the primary purpose of a full sectional view in technical drafting?
- To show the exterior profile of an object
- To reveal interior features by passing a cutting plane through the entire object (Correct answer)
- To display dimensions along the perimeter of a part
- To indicate surface finish requirements on machined faces
Correct answer: To reveal interior features by passing a cutting plane through the entire object
A full section passes a cutting plane completely through the object to expose interior details that would otherwise appear as confusing hidden lines.
Question 2: What do section lines (cross-hatching) indicate in a sectional view?
- Areas of the object that are hollow or void
- Surfaces that have been finish-machined
- Solid material that has been cut through by the cutting plane (Correct answer)
- Hidden features located behind the cut surface
Correct answer: Solid material that has been cut through by the cutting plane
Section lines indicate the solid material actually cut by the cutting plane, distinguishing it from open interior spaces visible behind the cut.
Question 3: In a half-section view, how is the object divided to create the view?
- A single cutting plane removes the entire front half of the object
- Two cutting planes at 90° reveal one quarter in section and show three-quarters as exterior view (Correct answer)
- The object is split along a diagonal to expose interior and exterior simultaneously
- The top half is removed to expose internal features from above
Correct answer: Two cutting planes at 90° reveal one quarter in section and show three-quarters as exterior view
A half-section uses two cutting planes at 90° so one quarter of the object appears in section while the remaining three-quarters retains its exterior view.
Question 4: What type of line is used to represent the cutting plane on a drawing?
- A thin continuous line with tick marks at intervals
- A thick chain line (long-short-long dash) with arrows showing the viewing direction (Correct answer)
- A dashed hidden line with arrowheads at both ends
- A phantom line with circles at each end indicating the cut path
Correct answer: A thick chain line (long-short-long dash) with arrows showing the viewing direction
The cutting plane line is a thick chain line with arrows at its ends indicating the direction from which the resulting section is viewed.
Question 5: What is the primary purpose of an auxiliary view in engineering drawing?
- To provide an isometric three-dimensional overview of the part
- To show the true size and shape of an inclined or oblique surface (Correct answer)
- To display all hidden lines that cannot appear in the principal views
- To create a scaled-down version of the part for the title block
Correct answer: To show the true size and shape of an inclined or oblique surface
Auxiliary views project perpendicular to an inclined surface so its true dimensions are preserved, avoiding the foreshortening seen in standard principal views.
Question 6: What is a broken-out section?
- A section view that has been interrupted with a break line to fit on the sheet
- A partial section that uses an irregular break line to locally expose an interior feature (Correct answer)
- A section created by breaking the object along its line of symmetry
- A section view that has been removed to a separate detail elsewhere on the sheet
Correct answer: A partial section that uses an irregular break line to locally expose an interior feature
A broken-out section uses a freehand break line to remove only a small portion of the exterior, exposing a specific interior feature without committing to a full or half section.
Question 7: Which ANSI/ASME standard governs multiview and sectional view drawings?
- ANSI/ASME Y14.2
- ANSI/ASME Y14.3 (Correct answer)
- ANSI/ASME Y14.5
- ANSI/ASME Y14.100
Correct answer: ANSI/ASME Y14.3
ANSI/ASME Y14.3 specifically covers multiview and sectional view drawings, establishing requirements for cutting planes, section lines, and auxiliary views.
CDT Sectional Views & Auxiliary Views 1
What is the primary purpose of a full sectional view in technical drafting?