Theory of Machine
An exact straight line motion mechanism is a

Hart's mechanism
Peaucellier's mechanism
Scott-Russell's mechanism
All of these

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

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

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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 interference is inherently absent.
The pressure angle is constant throughout the teeth engagement.
The variation in centre distance of shafts increases radial force.

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