Machine Design
According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

80 to 90%
63 to 70%
45 to 60%
70 to 83%

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

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
Resists fracture due to high impact loads

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