In a band and block brake, the ratio of tensions on tight side and slack side of

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Question

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)

Options:

A . T₁/T₂ = μ. θ. n

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

C . T₁/T₂ = (μ θ)n

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

Answer: Option D

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