Machine Design
In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as

Pressure angle
Helix angle
Pitch lead angle
None of these

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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
Draw into wires by the application of a tensile force
Retain deformation produced under load permanently
Regains its original shape after deformation when the external forces are removed

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