Question

The two elements of a pair are said to form a higher pair, when they

(a) have a surface contact when in motion

(b) have a line or point contact when in motion

(c) are kept in contact by the action of external forces, when in motion

(d) permit relative motion

This question was posed to me in semester exam.

Question is taken from Kinematic Pair in division Simple Mechanisms of Machine Kinematics

Answer 1

The correct option is (b) have a line or point contact when in motion

Explanation: When the two elements of a pair have a line or point contact when relative motion takes place and the motion between the two elements is partly turning and partly sliding, then the pair is known as higher pair.