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 [(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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Theory of Machine
Angle of descent of cam is defined as the angle

Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
During which the follower returns to its initial position
Through which the cam rotates during the period in which the follower remains in the highest position
Of rotation of the cam for a definite displacement of the follower

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Theory of Machine
In order to give a complete secondary balance of a multi-cylinder inline engine,

The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
Both (A) and (B)
None of these
The algebraic sum of the secondary forces must be equal to zero

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