Question

The curve generated by a point fixed to a circle outside its circumference as it rolls along a straight line is called a _________

(a) Inferior epitrochoid

(b) Superior trochoid

(c) Inferior trochoid

(d) Superior epitrochoid

The question was asked in an online quiz.

The origin of the question is Curves Used in Engineering Practice in section Lettering Practice, Scales & Curves of Civil Engineering Drawing

Answer 1

The correct option is (b) Superior trochoid

Best explanation: Trochoid is a curve generated by a point fixed to a circle, within or outside its circumference, as the circle rolls along a straight line and if the points would had have been outside the circumference of the circle then it would have been called as superior trochoid. The below diagram shows a superior trochoid.