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
0.75 and 1
0.50 and 0.75

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Machine Design
An open belt drive is used when

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

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