Machine Design
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt is the tensile stress for the shell material, then thickness of shell is equal to

pd/2σt
pd/4σt
pd/σt
pd/3σt

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Machine Design
In oilness bearings

Do not require external supply of lubricant
The oil film is maintained by supplying oil under pressure
The oil film pressure is generated only by the rotation of the journal
Grease required to be applied after some intervals

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Machine Design
Castle nut is a locking device in which

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
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
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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