Question

A sliding member AB has attached to a rocker BC, this BC is attached to crank CD. D is fixed end and as crank is rotating about D the slider slides parallel to it. What is the locus of C?

(a) Ellipse

(b) Circle

(c) Line

(d) Semi-circle

I had been asked this question in a national level competition.

I would like to ask this question from Loci of Points by Different Methods topic in chapter Loci of Points & Orthographic Projections of Engineering Drawing

Answer 1

The correct choice is (b) Circle

Explanation: The whole mechanism given here is a slider crank mechanism. The asked point C which is at end of crank always rotates around the D and the member length will not change so the curve traced by that point is circle.