Theory of Machine
Sense of tangential acceleration of a link

Is opposite to that of velocity
Is same as that of velocity
Could be either same or opposite to velocity
Is perpendicular to that of velocity

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Theory of Machine
In a band and block brake, the ratio of tensions on tight side and slack side of the band is (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the center of drum, and n = Number of blocks)

T₁/T₂ = μ. θ. n
T₁/T₂ = (μ θ)n
T₁/T₂ = [(1 - μ tanθ)/(1 + μ tanθ)]n
T₁/T₂ = [(1 + μ tanθ)/(1 - μ tanθ)]n

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Theory of Machine
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then

Both open belt drive and crossed belt drive is recommended
Crossed belt drive is recommended
Open belt drive is recommended
The drive is recommended depending upon the torque transmitted

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