CD Sectional Views & Auxiliary Views 1 — Questions and Answers
Question 1: What is the primary purpose of a sectional view in technical drawing?
- To show the exterior profile of an object
- To reveal internal features that would otherwise be hidden (Correct answer)
- To replace all orthographic views
- To display surface texture information
Correct answer: To reveal internal features that would otherwise be hidden
Sectional views cut through an object to expose interior features that would appear as confusing hidden lines in standard orthographic views.
Question 2: Which line type represents the cutting plane in a sectional view per ASME standards?
- A thin, solid continuous line
- A medium-weight dashed line
- A thick alternating long-and-short dash line with arrows indicating the direction of sight (Correct answer)
- A long dash–double short dash phantom line
Correct answer: A thick alternating long-and-short dash line with arrows indicating the direction of sight
The cutting plane line is a thick line of alternating long and short dashes with arrowheads at the ends indicating the viewing direction into the section.
Question 3: In a full section view, how does the cutting plane pass through the object?
- It passes completely through the object along one axis, exposing the full interior (Correct answer)
- It cuts only halfway through the object along the center line
- It bends to pass through multiple offset features
- It revolves around a central feature
Correct answer: It passes completely through the object along one axis, exposing the full interior
A full section passes the cutting plane entirely through the object along one axis, typically along a center line, to expose the full interior cross-section.
Question 4: What is the standard angle for section lines (hatch lines) in a technical drawing per ASME convention?
- 30°
- 45° (Correct answer)
- 60°
- 90°
Correct answer: 45°
Per ASME standards, section lines are typically drawn at 45° to the horizontal unless the part's outline itself is at or near 45°, in which case a different angle is used.
Question 5: In a half-section view, what is shown on each side of the cutting plane line?
- Both halves show only the exterior
- One half shows the sectioned interior and the other shows the unsectioned exterior (Correct answer)
- Both halves show the full interior
- One half is physically removed and only the interior is drawn
Correct answer: One half shows the sectioned interior and the other shows the unsectioned exterior
A half-section divides a symmetrical object along its center line, showing the interior (sectioned) on one side and the uncut exterior on the other.
Question 6: A broken-out section is best described as:
- A section created when drawing paper is physically torn
- A small portion of an object's interior revealed by an irregular freehand break line (Correct answer)
- A section where the part is completely broken apart and separated
- Multiple disconnected sectional cuts through the same object
Correct answer: A small portion of an object's interior revealed by an irregular freehand break line
A broken-out section uses a short, irregular break line to expose only a limited interior area of an object without the need for a full or half section.
Question 7: How is a revolved section created?
- The entire object is rotated 90° before the section is taken
- The cross-section is rotated 90° into the plane of the view and superimposed directly onto the longitudinal view (Correct answer)
- The cutting plane revolves around the object's axis
- The section is created by revolving the object in an isometric projection
Correct answer: The cross-section is rotated 90° into the plane of the view and superimposed directly onto the longitudinal view
A revolved section is formed by rotating the cross-sectional shape 90° into the plane of the longitudinal view and drawing it directly on that view in place.
CD Sectional Views & Auxiliary Views 1
What is the primary purpose of a sectional view in technical drawing?