Machine Design
In a steam engine, the valve rod is connected to an eccentric rod by means of

Knuckle joint
Universal joint
Cotter joint
Flange coupling

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Machine Design
In worm, gears, pitch lead angle is

Half the angle between two inclined faces in axial plane
None of these
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

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Machine Design
In case of V belt drive

The belt should not touch the bottom of groove in the pulley
The belt should touch the bottom of groove in the pulley
None of these
The belt should not touch the sides of groove in the pulley

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