Machine Design
A self locking screw has

Coefficient of friction is greater than tangent of load angle
Course threads
Hole for inserting split pin
Fine threads

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Machine Design
When the belt is transmitting maximum power,

The tension in tight side is twice the centrifugal tension
The tension in slack side is equal to the centrifugal tension
None of these
The tension in tight side is thrice the centrifugal tension

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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
New and old belts will cause vibrations
Only one belt cannot be fitted with other used belts
Belts are available in sets

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