Machine Design
When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as

Crown bevel gears
Mitre gears
Angular bevel gears
Internal bevel gears

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Machine Design
Castle nut is a locking device in which

A slot is cut partly is middle of nut and then slot reduced by tightening a screw
One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
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
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

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Machine Design
Stress concentration is caused due to

Variation in properties of material from point to point in a member
All of these
Abrupt change of section
Pitting at points or areas at which loads on a member are applied

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