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

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

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Machine Design
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

The effect of the restraining action of the heads at the end of the pressure vessel is neglected
The effect of curvature of the cylinder wall is neglected
All of these
The tensile stresses are uniformly distributed over the section of the walls

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Machine Design
Cold working

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

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