Loci: Points, Cams & Mechanisms 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. What is a locus?
The path traced by a point as it moves according to a defined rule or constraint
A type of hidden line used in orthographic drawings
A fixed point that never moves on a mechanism
The scale ratio used on a drawing
Answer: The path traced by a point as it moves according to a defined rule or constraint — A locus (plural loci) is the path traced by a point as it moves according to a defined rule or constraint, such as the geometry of a mechanism.
Easy
2. How many points may CAPS Grade 12 EGD track on any one schematic mechanism drawing when constructing loci?
A maximum of three
Exactly one
A maximum of ten
There is no limit
Answer: A maximum of three — CAPS content limits Grade 12 loci-of-points construction to a maximum of three points tracked on any one schematic mechanism drawing.
Medium
3. Name the shape of locus traced by a point that is rigidly fixed to a component rotating about a fixed centre.
Answer: a circle — A point rigidly fixed to a component rotating about a fixed centre traces a simple circle as its locus.
