Machine Design
Auto frettage is the method of

Joining thick cylinders
Pre-stressing thick cylinders
Calculating stresses in thick cylinders
Increasing the life of thick cylinders

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Machine Design
A bolt of M 24 × 2 means that

The pitch of the thread is 24 mm and depth is 2 mm
The nominal diameter of bolt is 24 mm and pitch is 2 mm
The effective diameter of bolt is 24 mm and there are 2 threads per cm
Cross-sectional area of the threads is 24 mm²

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

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