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

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

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Machine Design
An open belt drive is used when

Shafts are arranged parallel and rotate in the same directions
Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the opposite directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft

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Machine Design
For unequal width of butt straps, the thicknesses of butt straps are

0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
0.75 t for both the straps on the inside and outside
0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside
0.625 t for both the straps on the inside and outside

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