Machine Design
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

Larger than
Equal to
None of these
Smaller than

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

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

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