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

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

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Machine Design
In worm, gears, pitch lead angle is

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

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Machine Design
Crowning on pulley helps

To increase pulley life
In decreasing the slip of the belt
To keep the belt in centre on a pulley while it is in motion
In increasing the slip of the belt

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