Machine Design
The longitudinal joint in boilers is used to get the required

Diameter of boiler
Length of boiler
Length and diameter of boiler
Efficiency of boiler

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Machine Design
When a machine member is subjected to torsion, the torsional shear stress set up in the member is

Maximum at both the centroidal axis and outer surface of the member
Zero at both the centroidal axis and outer surface of the member
Maximum at the centroidal axis and zero at the outer surface of the member
Zero at the centroidal axis and maximum at the outer surface of the member

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Machine Design
Stress concentration is caused due to

Abrupt change of section
Variation in properties of material from point to point in a member
Pitting at points or areas at which loads on a member are applied
All of these

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Machine Design
For unequal width of butt straps, the thicknesses of butt straps are

0.625 t for both the straps on the inside and outside
0.75 t for both the straps on the inside and outside
0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside

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