Machine Design
A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is

5 N-m
15 N-m
10 N-m
7 N-m

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Machine Design
Spring stiffness is

Load required to produce unit deflection
Its capability of storing energy
Its ability to absorb shocks
Ratio of coil diameter to wire diameter

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Machine Design
Plastic flow in ductile materials

Increases the seriousness of static loading stress concentration
Depends on other considerations
Lessens the seriousness of static loading stress concentration
Has no effect on it

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Machine Design
A tap bolt

Has head at one end and other end fits into a tapped hole in the other part to be joined
Has both the ends threaded
Has a head on one end and a nut fitted to the other
Has pointed threads

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