Endurance limit of a beam subjected to pure bending decreases

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Endurance limit of a beam subjected to pure bending decreases with

1. incr ease i n t he sur face r oughness and increase in the size of the beam
2. decr ease in t he sur face r oughness and increase in the size of the beam
3. decr ease in t he sur face r oughness and decrease in the size of the beam
4. incr ease i n t he sur face r oughness and decrease in the size of the beam

Correct Option: A

NA