Question

The lower pairs are ___________ pairs.

(a) self-closed pair

(b) force-closed pair

(c) screw pair

(d) none of the mentioned

I got this question by my college director while I was bunking the class.

The question is from Classification of Kinematic Pairs in chapter Simple Mechanisms of Machine Kinematics

Answer 1

The correct option is (a) self-closed pair

For explanation: When the two elements of a pair are connected together mechanically in such a way that only required kind of relative motion occurs, it is then known as self closed pair. The lower pairs are self closed pairs.