Open pairs are those which have

A point or line contact between the two elements when in motion
B surface contact between the two elements when in motion
C elements of pairs not held together mechanically
D two elements that permit relative motion

Correct Answer: elements of pairs not held together mechanically

Two elemets which are not held together form open pairs. Two elements held together mechanically form a closed pair.
Bissoy MCQ
#Machine Kinematics #Grubler’s Criterion for Plane Mechanisms

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