Allied & ICAR Exam Bank • ALLIED_0117 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:

A deep groove ball bearing has a dynamic load rating $C = 30\text{ kN}$. If it operates under an equivalent radial load $P = 10\text{ kN}$, its rating life $L_{10}$ in millions of revolutions is:

Answer Key:

27

Step-by-Step Solution & Explanation

For ball bearings ($p = 3$): $L_{10} = (C / P)^3 = (30 / 10)^3 = 3^3 = 27$ million revolutions.
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