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

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

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Machine Design
A compound belt drive is used when

None of these
Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the opposite directions
Shafts are arranged parallel and rotate in the same directions

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