In a four bar chain or quadric cycle chain
(a) each of the four pairs is a turning pair
(b) one is a turning pair and three are sliding pairs
(c) two are turning pairs and two are sliding pairs
(d) three are turning pairs and one is a sliding pair
This question was posed to me by my college director while I was bunking the class.
The question is from Mechanism topic in division Simple Mechanisms of Machine Kinematics