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

T₁/T₂ = μθ × n
T₁/T₂ = [(1 - μ tanθ)/ (1 + μ tanθ)]n
T₁/T₂ = (μθ)n
T₁/T₂ = [(1 + μ tanθ)/ (1 - μ tanθ)]n

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Machine Design
According to Indian standard specifications, 100 H6/g5 means that

Tolerance grade for the hole is 6 and for the shaft is 5
Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7
Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7
Tolerance grade for the shaft is 6 and for the hole is 5

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Machine Design
A bolt

Has both the ends threaded
Has a head on one end and a nut fitted to the other
Has head at one end and other end fits into a tapped hole in the other part to be joined
Is provided with pointed threads

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