Theory of Machine
A kinematic chain is known as a mechanism when

None of these
None of the links is fixed
Two of the links are fixed
One of the links is fixed

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Theory of Machine
Angle of ascent of cam is defined as the angle

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

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Theory of Machine
In a four bar chain or quadric cycle chain

Two are turning pairs and two are sliding pairs
One is a turning pair and three are sliding pairs
Three are turning pairs and one is a sliding pair
Each of the four pairs is a turning pair

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Theory of Machine
Open pairs are those which have

Two elements that permit relative motion
Surface contact between the two elements when in motion
Point or line contact between the two elements when in motion
Elements of pairs not held together mechanically

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