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

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

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Machine Design
In worm, gears, pitch lead angle is

None of these
The angle between the tangent to the pitch helix and the plane of rotation
Half the angle between two inclined faces in axial plane
The angle between the tangent to the pitch helix and an element of the cylinder

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