CD Sectional Views & Auxiliary Views 2 — Questions and Answers
Question 1: What distinguishes an offset section from a full section?
- An offset section cuts the object at an oblique angle
- An offset section uses a stepped cutting plane that bends to pass through features not on a single plane (Correct answer)
- An offset section is placed beside the main view rather than replacing it
- An offset section shows only the offset features of a symmetrical object
Correct answer: An offset section uses a stepped cutting plane that bends to pass through features not on a single plane
An offset section uses a cutting plane that steps (offsets) at right angles to pass through multiple important features that do not all lie in a single plane.
Question 2: In an aligned section, how are asymmetrically placed features (such as holes or ribs at an angle) treated?
- They are omitted entirely from the section
- They are shown in their true angular position only
- They are rotated (aligned) to the cutting plane before projecting to the section view (Correct answer)
- They are shown with phantom lines within the section
Correct answer: They are rotated (aligned) to the cutting plane before projecting to the section view
In aligned sections, angled features are revolved to align with the cutting plane before projection so their true shape and relationship are shown without distortion.
Question 3: What is the primary purpose of an auxiliary view?
- To add supplemental dimensions to an existing principal view
- To show the true size and shape of an inclined surface not parallel to any principal projection plane (Correct answer)
- To provide an enlarged detail view of a small feature
- To show hidden internal features of a curved surface
Correct answer: To show the true size and shape of an inclined surface not parallel to any principal projection plane
Auxiliary views are projected perpendicular to an inclined surface so it appears in true size and shape, since the inclined surface appears foreshortened in the principal views.
Question 4: A primary auxiliary view is projected from:
- Another auxiliary view
- One of the three principal views (front, top, or right side) (Correct answer)
- An isometric view
- A removed section view
Correct answer: One of the three principal views (front, top, or right side)
A primary auxiliary view is always projected directly and perpendicularly from one of the three standard principal orthographic views.
Question 5: How are hidden lines typically handled in auxiliary views?
- Always shown in full
- Omitted unless they are essential for clarity (Correct answer)
- Always converted to visible lines
- Shown as phantom lines
Correct answer: Omitted unless they are essential for clarity
Hidden lines are generally omitted in auxiliary views to keep the drawing uncluttered, unless they are necessary to describe the shape.
Question 6: What is a partial auxiliary view?
- A view showing the entire object projected onto the auxiliary plane
- A view limited to only the inclined surface in true shape, omitting the rest of the object (Correct answer)
- A view showing only half of the inclined surface
- An auxiliary view with visible lines only and no dimensions
Correct answer: A view limited to only the inclined surface in true shape, omitting the rest of the object
A partial auxiliary view restricts the projection to just the inclined surface requiring true-shape representation, reducing drawing clutter.
Question 7: Which statement correctly describes a secondary auxiliary view?
- It is projected from a primary auxiliary view to show the true shape of an oblique surface not parallel to any principal plane (Correct answer)
- It is a second regular orthographic view added when the standard views are insufficient
- It is an auxiliary view created by combining two sectional cuts
- It is a back view used when the standard rear view is insufficient
Correct answer: It is projected from a primary auxiliary view to show the true shape of an oblique surface not parallel to any principal plane
A secondary auxiliary view is projected from a primary auxiliary view (not directly from a principal view) and is used to show the true shape of a surface oblique to all three principal planes.
CD Sectional Views & Auxiliary Views 2
What distinguishes an offset section from a full section?