Machine Design
In block brakes, the ratio of shoe width to wheel diameter is taken between

0.50 and 0.75
0.1 and 0.25
0.75 and 1
0.25 and 0.50

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

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

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