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

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

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Theory of Machine
Cam angle is defined as the angle

Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
Through which, the cam rotates during the period in which the follower remains in the highest position
Of rotation of the cam for a definite displacement of the follower
During which the follower returns to its initial position

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Theory of Machine
A system of masses rotating in different parallel planes is in dynamic balance if the

Resultant couple is equal to zero
Resultant force is equal to zero
Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
Resultant force and resultant couple are both equal to zero

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