Machine Design
For longitudinal joint in boilers, the type of joint used is

Any one of the above
Butt joint with double cover plate
Lap joint with one ring overlapping the other
Butt joint with single cover plate

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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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