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GATE 2018 ME (ME1) – Question 42

Machine Design · Rolling and sliding contact bearings · 2 marks · Multiple choice

A self-aligning ball bearing has dynamic rating C₁₀ = 35 kN for one million revolutions. Equivalent radial load is 45 kN. Expected life in millions of revolutions is ______.

  1. below 0.5
  2. 0.5 to 0.8
  3. 0.8 to 1.0
  4. above 1.0

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Show answer and explanation

Correct answer: (A) below 0.5

Explanation

Ball-bearing rated life in millions of revolutions is $L_{10}=(C/P)^3=(35/45)^3=0.4705$, below 0.5 (A).