Machine Design
The pipe joint mostly used for pipes carrying water at low pressures is

Union joint
Socket joint
Nipple joint
Spigot and socket joint

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

Regain 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
Resist fracture due to high impact loads

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