Question

The generating circle will be inside the directing circle for _________

(a) Cycloid

(b) Inferior trochoid

(c) Inferior epitrochoid

(d) Hypocycloid

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This is a very interesting question from Construction of Cycloidal Curves topic in division Geometrical Construction of Engineering Drawing

Answer 1

The correct choice is (d) Hypocycloid

Easiest explanation: The generating circle will be inside the directing circle for hypocycloid or hypotrochoid. 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 or over circle if not represented with hypo as a prefix.