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

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

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

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

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