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Machine Design
Design Against Static Load
GATE 2011
Medium

Two identical ball bearings P and Q are operating at loads 30 kN and 45 kN respectively. The ratio of the life of bearing P to the life of bearing Q is

  • A81/16
  • 27/8
  • C9/4
  • D3/2

Explanation

For ball bearings, life L ∝ (1/P)³. LifeP/LifeQ = (PQ/PP)³ = (45/30)³ = (1.5)³ = 3.375 = 27/8.

Source: GATE ME 2011 (2011)

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