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

Cotter joint
Knuckle joint
Universal coupling
Bolted joint

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Machine Design
Elastic nut is a locking device in which

A slot is cut partly in middle of nut and then slot reduced by tightening a screw
One small nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
Hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip
Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at other end

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Machine Design
According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by

None of these
Equating tearing resistance of the plate to the shearing resistance of the rivets
Equating tearing resistance of the plate to the crushing resistance of the rivets
Equating shearing resistance to the crushing resistance of the rivets

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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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