Which of the following is an example of sliding pair?
A
Piston and cylinder of a reciprocating steam engine
B
Shaft with collars at both ends fitted into a circular hole
C
Lead screw of a lathe with nut
D
Ball and a socket joint
Correct Answer: Piston and cylinder of a reciprocating steam engine
When the nature of contact between the element of a pair is such that it can only slide relative to the other, the pair is known as a sliding pair and can be found in piston and cylinder of a reciprocating steam engine.