The drawing shows a machined shaft. The purpose of providing rounded grooves at M and N is to

Supply lubricating oil for bearing mounting

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Facilitate facing operation

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Facilitate grinding of bearing mounting surface

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Reduce stress concentration

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Solution

The correct option is A Supply lubricating oil for bearing mounting
The drawing shows a machined shaft. The purpose of providing rounded grooves at M and N is to supply lubricating oil for bearing mounting.

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