Machine Design
In nitrated parts, the origins of the fatigue cracks will occur at

None of these
Surface
Within the core
Just below the surface

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Machine Design
Pitch point of a cam is

A point on the pitch curve having maximum pressure angle
Any point on the pitch circle
A point on the pitch curve having minimum pressure angle
Any point on the pitch curve

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

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