Machine Design
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to

Make M/I constant throughout the length of the leaf
Permit each leaf to act as an overhanging beam
Obtain variable moment of inertia (I) in each leaf
Have variable bending moment (M) in each leaf

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Machine Design
Jam 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
Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end
A slot is cut partly in middle of nut and then slot reduced by tightening a screw

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Machine Design
Which is correct statement? Stress concentration in static loading is

Very serious in ductile materials and less serious in brittle materials
Equally serious in both types of materials
Very serious in brittle materials and less serious in ductile materials
Seriousness would depend on other factors

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