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

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

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Machine Design
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

The tensile stresses are uniformly distributed over the section of the walls
The effect of the restraining action of the heads at the end of the pressure vessel is neglected
The effect of curvature of the cylinder wall is neglected
All of these

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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
Retain deformation produced under load permanently
Draw into wires by the application of a tensile force
Resist fracture due to high impact loads

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