Allied & ICAR Exam Bank • ALLIED_2820 NAT • 2 Marks

Section 2: Farm Machinery

Machine Design

Subtopic: Measurement of force, stress, torque, speed, displacement and acceleration on machine elements – shafts, couplings, keys, bearings and knuckle joints

Question Statement:

If the dynamic radial load on a deep groove ball bearing is halved ($P \to P/2$), its rated rating life $L_{10}$ increases by a factor of:

Answer Key:

8

Step-by-Step Solution & Explanation

$L_{10} \propto (1/P)^3$. Halving load gives $(2)^3 = 8$-fold life increase.
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