Machine Design
When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be

Buttress threads
Knuckle threads
Square threads
Acme threads

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Machine Design
Pitch point of a cam is

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

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