Theory of Machine
The instantaneous centers which vary with the configuration of mechanism are called

None of these
Permanent instantaneous centers
Fixed instantaneous centers
Neither fixed nor permanent instantaneous centers

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Theory of Machine
In elliptical trammels

Two pairs turning and two pairs sliding
One pair turning and three pairs sliding
All four pairs are turning
Three pairs turning and one pair sliding

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

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
Through which the cam rotates during the period in which the follower remains in highest position

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