Theory of Machine
The train value of a gear train is

Equal to velocity ratio of a gear train
Always less than unity
Always greater than unity
Reciprocal of velocity ratio of a gear train

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

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Theory of Machine
Open pairs are those which have

Surface contact between the two elements when in motion
Elements of pairs not held together mechanically
Point or line contact between the two elements when in motion
Two elements that permit relative motion

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