Mechanical Engineering - Theory of machines - Discussion

Right answer is cam and follower.

When two links of a kinematic pair are not held together mechanically but remain in contact with each other under the action of the force of gravity or some spring action, then such a pair is called an open pair. EG. cam and follower as shown in the figure are in contact due to the force of gravity and the forces exerted by the spring.

Closed pair is the Answer.

When two links of a kinetic pair are held together mechanically, in such a manner that only the required type of relative motion occurs, they are called closed pair. All lower pairs and some higher pairs are closed pairs. Example: enclosed cam and follower makes a closed pair.

When two links of a kinematic pair are not held together mechanically but remain in contact with each other under the action of the force of gravity or some spring action, then such a pair is called an open pair. Eg: cam and follower as shown in figure are in contact due to force of gravity and the forces exerted by the spring.

Cam and follower is the right answer.

What is the basic parameter to decide a pair to open pair?

The answer should be D.

Cam & follower is the right answer.

(a) Ball and Socket is an example of Spherical pair.

(b) Journal bearing is an example of Rolling pair.

(c) Lead screw and nut is an example of Screw pair/ Helical Pair.

(d) Cam and follower is an example of the Open pair.

Ball and socket joint is a Spherical pair.

Answer of this question is (D) cam and follower is an open pair.

Cam and follower is an open pair.