Machine Design
Stress concentration in static loading is more serious in

Depends on other factors
Equally serious in both cases
Ductile materials
Brittle materials

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Machine Design
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to

Make M/I constant throughout the length of the leaf
Permit each leaf to act as an overhanging beam
Obtain variable moment of inertia (I) in each leaf
Have variable bending moment (M) in each leaf

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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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