Machine Design
When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

Axially upwards
None of these
Axially upwards or downwards
Axially downwards

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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

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

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