Sectional views in technical drawing: The Cutting Plane line indicates where the object is imagined to be cut and the direction of sight; it does not reveal the type of material used. Evaluate the statement.

Introduction / Context:
In mechanical and architectural drafting, sectional views help readers see interior features by slicing through a part or assembly. This question focuses on the role of the Cutting Plane line versus the role of section lining (hatching) in communicating information such as where the cut is taken and what material is present.

Given Data / Assumptions:

• A Cutting Plane line is drawn on the parent view to show the location of the cutting plane and the viewing direction.
• Hatching (section lines) fills the region that has been cut by the plane.
• Material identification, if shown graphically, is conveyed by hatch pattern conventions or is specified by notes, not by the Cutting Plane line itself.

Concept / Approach:
The Cutting Plane line is a location and direction indicator. Section lining is the fill pattern in the resulting sectional view. Material type is commonly communicated by a general hatch (e.g., ANSI 31) plus a note in the bill of materials or a callout. Specialized hatch patterns may also suggest material families, but that occurs in the sectioned area, not on the Cutting Plane line.

Step-by-Step Solution:
Identify function of Cutting Plane line: shows where the slice occurs and where the viewer looks (arrowheads).Identify function of section lining: graphically indicates cut regions; patterns can represent materials in some standards.Match statement to functions: the statement claims the Cutting Plane line reveals material type.Conclude mismatch: material is not conveyed by the Cutting Plane line; therefore the statement is incorrect.

Verification / Alternative check:
Review any standard drafting legend: Cutting Plane lines have prescribed line types and arrows, while separate hatch legends and notes define material information.

Why Other Options Are Wrong:
“Correct” wrongly assigns material meaning to the Cutting Plane line. “Only correct for cast iron parts” and “Correct when using ISO hatches” confuse hatch pattern conventions with the Cutting Plane line. “Depends on sheet scale” is irrelevant to the semantic meaning of the line.

Common Pitfalls:
Confusing cutting-plane indication with hatching semantics; mixing up general section lining with specific material callouts.

Final Answer:
Incorrect