Alignment rule: The center line of a cylindrical feature (even if hidden) in the front view should align with the center mark/axis of the corresponding circular appearance in an auxiliary view. Determine whether this statement is correct.

Introduction / Context:
Consistent alignment between related views is fundamental in drafting. Cylindrical features often appear as circles in one view and as rectangles/lines in another. The statement claims that the cylinder’s center line in the front view must line up with the center mark of the corresponding circle in the auxiliary view. We analyze this alignment requirement.

Given Data / Assumptions:

• Same physical axis is represented in different views.
• Projection lines carry points and axes between views.
• Hidden status in one view does not change geometric alignment.

Concept / Approach:
The axis is a single 3D line. Orthographic and auxiliary projections map that axis consistently. Therefore, the center line in the parent view must be co-linear (via projectors) with the axis/center mark in the related view, ensuring that holes, bores, and shafts are unambiguously located.

Step-by-Step Solution:
1) Identify the cylindrical feature in both views.2) Draw projection lines to carry the axis location.3) Confirm that the center line in the parent view aligns with the auxiliary circle’s center.4) Adjust if grid/scale caused drift or plotting error.

Verification / Alternative check:
Cross-check dimensions from datums; misalignment leads to conflicting coordinates and assembly errors.

Why Other Options Are Wrong:
“Incorrect”: Violates projection consistency.“Only visible edges align”: Visibility does not affect geometric correspondence.“Alignment is optional”: Optional alignment invites misinterpretation and nonconformity.

Common Pitfalls:
Forgetting to pass the axis through construction; failing to center the auxiliary circle precisely.

Final Answer:
Correct