Machine Design
The valve rod in a steam engine is connected to an eccentric rod by

Knuckle joint
Universal coupling
Bolted joint
Cotter joint

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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 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

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