Theory of Machine
Which one of the following is an exact straight line mechanism using lower pairs?

Grasshopper mechanism
Peaucellier’s mechanism
Robert’s mechanism
Watt’s mechanism

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

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

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