Machine Design
In a steam engine, the piston rod is usually connected to the cross-head by means of a

Universal joint
Cotter joint
Knuckle joint
Oldham coupling

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Machine Design
In worm, gears, pitch lead angle is

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

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Machine Design
Coaxing is the procedure of increasing

Fatigue limit by over-stressing the metal by successively increasing loadings
Metal strength by cycling
Metal resistance to corrosion by coating
Metal hardness by surface treatment

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