Theory of Machine
When the particles of a body moves perpendicular to its axis, then the body is said to have

Torsional vibration
None of these
Longitudinal vibration
Transverse vibration

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Theory of Machine
In gears, interference takes place when

Gear teeth are undercut
Gears do not move smoothly in the absence of lubrication
Pitch of the gears is not same
The tip of a tooth of a mating gear digs into the portion between base and root circles

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

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