Machine Design
The function of cutting oil when threading a pipe is to

Provide cooling action
Help removes chips
Lubricate the dies
All of these

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Machine Design
Cold working

Has no influence on fatigue strength
Alone has no influence on fatigue strength
Increases the fatigue strength
Decreases the fatigue strength

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

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