Half sections: Hidden lines should generally be omitted in sectioned views; in a half section they are not normally shown in the sectioned half, and shown in the unsectioned half only if needed. Assess the instruction “omit hidden lines from both halves whenever possible.”

Introduction / Context:
A half section combines one sectioned half and one exterior (unsectioned) half of the same view. This powerful convention simplifies depiction of symmetric parts. The treatment of hidden lines differs between the sectioned and unsectioned halves to preserve clarity without sacrificing necessary information.

Given Data / Assumptions:

• A half section displays interior features (sectioned half) and exterior features (unsectioned half) simultaneously.
• Hidden lines in sectioned views are typically omitted to avoid clutter; the cut reveals interior shapes directly.
• Hidden lines in the unsectioned half may be shown if needed to communicate essential features that remain concealed.

Concept / Approach:
Standards-based practice aims to minimize visual noise. Because the sectioned half already exposes interior details, hidden lines there are redundant. In the unsectioned half, hidden lines can still serve a purpose, for example to indicate holes or recesses that are not intersected by the cutting plane but are relevant to the design or manufacturing.

Step-by-Step Solution:
Identify what “both halves” implies: removing hidden lines from sectioned and unsectioned halves alike.Recall rule: omit hidden lines in the sectioned half; consider them selectively in the unsectioned half.Compare with the instruction: a blanket omission from both halves can delete needed information.Therefore the instruction is not generally correct.

Verification / Alternative check:
Look at standard examples of half sections: the unsectioned side often retains hidden lines to show features not cut by the plane but important for comprehension.

Why Other Options Are Wrong:
“Correct” overgeneralizes and risks loss of critical geometry. “Correct only for assemblies,” “Depends on projection angle,” and “Correct when scale is 1:1” add conditions that are not part of the rule; clarity, not assembly status or scale, drives the decision.

Common Pitfalls:
Either overusing hidden lines (clutter) or eliminating them everywhere (information loss). The best practice is selective use in the unsectioned half.

Final Answer:
Incorrect