Machine Design
When two non-intersecting and non-coplanar shafts are connected by gears, the arrangement is known as

Spur gearing
Spiral gearing
Bevel gearing
Helical gearing

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Machine Design
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

The effect of the restraining action of the heads at the end of the pressure vessel is neglected
All of these
The tensile stresses are uniformly distributed over the section of the walls
The effect of curvature of the cylinder wall is neglected

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Machine Design
Castle nut is a locking device in which

One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
A slot is cut partly is middle of nut and then slot reduced by tightening a screw
A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed 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 spitted and bent in reverse direction at other end

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