Project ForgeMachine Design
Design Against Static Load
GATE 2018
Medium
A self-aligning ball bearing has a basic dynamic load rating (C10, for 10⁶ revolutions) of 35 kN. If the equivalent radial load on the bearing is 45 kN, the expected life (in 10⁶ revolutions) is
- below 0.5
- B0.5 to 0.8
- C0.8 to 1.0
- Dabove 1.0
Explanation
L (in millions of revolutions) = (C/P)^p, with p=3 for ball bearings. L = (35/45)³ ≈ 0.778³ ≈ 0.47, which is below 0.5.
Source: GATE ME 2018 Session 1 (Set 1) (2018)
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