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

Square threads
Acme threads
Buttress threads
Knuckle threads

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Machine Design
The elasticity is the property of a material which enables it to

Resists fracture due to high impact loads
Regains its original shape after deformation when the external forces are removed
Draw into wires by the application of a tensile force
Retain deformation produced under load permanently

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