Line conventions on technical drawings: The meaning of each line is conveyed by its line style (pattern) and by its width (line weight), enabling readers to distinguish objects, hidden features, and centerlines.

Introduction / Context:
Reading a drawing requires fluency in line conventions. Different line styles and weights communicate hierarchy and function—critical for fabrication, inspection, and construction.

Given Data / Assumptions:

• Common styles: visible (object) lines, hidden lines, centerlines, phantom lines, cutting-plane lines, and dimension/extension lines.
• Line weight distinguishes importance; thicker lines usually represent visible edges.
• Standards (e.g., ASME Y14 or ISO) codify patterns and line widths.

Concept / Approach:
Human perception quickly differentiates line pattern and thickness. Using style and weight together creates a visual language: bold continuous lines for objects, broken lines for hidden features, chain lines for centers, etc.

Step-by-Step Solution:
Identify a feature class (e.g., visible edge).Select the prescribed line style (continuous) and weight (thicker).Apply different, codified conventions for hidden or center features.Thus, meaning is indeed indicated by both style and width.

Verification / Alternative check:
Compare a standards chart: each line type shows a unique pattern and recommended weight relative to sheet size and scale.

Why Other Options Are Wrong:
“Incorrect” conflicts with standards practice. Color is not primary in traditional monochrome drafting. Confining to specific disciplines or standards bodies ignores broad consensus.

Common Pitfalls:
Overusing a single pen weight; failing to distinguish hidden from centerlines; inconsistency across sheets.

Final Answer:
Correct