Theory of Machine
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be

Slightly more than 45 mm
45 mm
95 mm
Slightly less than 45 mm

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Theory of Machine
The contact ratio is given by

(Length of the arc of contact)/(Circular pitch)
(Length of the arc of approach)/cosφ
(Length of the path of approach)/(Circular pitch)
(Length of path of recess)/(Circular pitch)

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Theory of Machine
Which of the following statement is correct for involute gears?

A convex flank is always in contact with concave flank.
The pressure angle is constant throughout the teeth engagement.
The interference is inherently absent.
The variation in centre distance of shafts increases radial force.

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