General Drawing Conventions & Principles is one of 9 topics in the Grade 12 Engineering Graphics and Design CAPS syllabus, covered across 3 lessons on Study Vault. Below are real practice questions from this topic with full worked answers.
Sample practice questions
Easy
1. Which line type is used to represent a visible outline or edge of an object?
A continuous thick line
A dashed line
A chain thin line
A continuous thin freehand line
Answer: A continuous thick line — A continuous thick (object) line represents a visible outline or edge, drawn heavier than dimension or centre lines so the object stands out clearly.
Easy
2. Which line type represents a hidden edge that exists but cannot be seen from the current viewing direction?
A dashed (short-dash) line
A continuous thick line
A chain thin line
A continuous thin line
Answer: A dashed (short-dash) line — A dashed short-dash line represents hidden detail -- an edge, hole or feature obscured by material in front of it from the current viewing direction.
Medium
3. Name the line type made of alternating long and short dashes, used to mark the axis of symmetry of a cylindrical feature such as a hole or shaft.
Answer: centre line — A chain thin line (long dash, short dash, repeating) represents a centre line, marking the axis of symmetry of a cylindrical feature or the centre of a circle or arc.
