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

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

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Machine Design
Pitch point of a cam is

Any point on the pitch curve
A point on the pitch curve having maximum pressure angle
A point on the pitch curve having minimum pressure angle
Any point on the pitch circle

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