Machine Design
A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be

6 kN/m
30 kN/m
12 kN/m
24 kN/m

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Machine Design
Cold working

Decreases the fatigue strength
Alone has no influence on fatigue strength
Increases the fatigue strength
Has no influence on fatigue strength

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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
Have variable bending moment (M) in each leaf
Permit each leaf to act as an overhanging beam
Obtain variable moment of inertia (I) in each leaf

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