Theory of Machine
Which of the following is a lower pair?

Cam and follower
Piston and cylinder
Both (A) and (B) above
Ball and socket i

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Theory of Machine
When the belt is stationary, it is subjected to some tension known as initial tension. The value of this tension is equal to the

Average tension of the tight side and slack side of the belt
Tension in the slack side of the belt
Tension in the tight side of the belt
Sum of the tensions on the tight side and slack side of the belt

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