Multiple choice general knowledge science & technology

What is the meaning of a L10 life of bearings?

  1. Life the bearing is 10 million cycles

  2. Life is 10 million sec under the specified dynamic load

  3. Life of the 10% of the bearing

  4. 90% bearing in a lot will give mimum of 1 million revolution under the dynamic load specified by the manufacturer
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D Correct answer
Explanation

L10 life in bearing terminology means that 90% of a group of identical bearings operating under identical conditions will survive for a minimum of 1 million revolutions before the first evidence of fatigue develops. The 'L10' designation specifically refers to the rating life at which 10% of bearings are expected to fail - meaning 90% survive.

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