Machine Design
A screw is said to be over hauling screw, if the

Friction angle is equal to helix angle
Friction angle is more than helix angle
Efficiency of screw is 100%
Friction angle is less than helix angle

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Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

Belts are available in sets
Only one belt cannot be fitted with other used belts
The new belt will carry more than its share and result in short life
New and old belts will cause vibrations

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