Theory of Machine
Which of the following is an example of a higher pair?

All of the listed here
Toothed gearing
Ball and roller bearing
Belt and rope drive

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Theory of Machine
In elliptical trammels

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

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Theory of Machine
The frictional torque transmitted in a flat collar bearing, considering uniform wear, is (where r₁ and r₂ = External and internal radii of collar respectively)

(1/2) μ W (r₁ + r₂)
(2/3) μ W (r₁ + r₂)
(2/3) μ W [(r₁³ - r₂³)/(r₁² - r₂²)]
(1/2) μ W [(r₁³ - r₂³)/(r₁² - r₂²)]

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