Theory of Machine
The ratio of height of Porter governor (when length of arms and links are equal) to the height of Watt's governor is (where m = Mass of the ball, and M = Mass on the sleeve)

M/(m + M)
m/(m + M)
(m + M)/M
(m + M)/m

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

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

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Theory of Machine
Higher pairs are those which have

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

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