Question Bank • QB_FP_103 NAT • 2 Marks

Section 3: Farm Power

Farm Power

Subtopic: Calculation of power, torque, fuel consumption, heat load and power losses

Question Statement:

A tractor tire has an unloaded overall diameter of $1.50\text{ m}$. Under a dynamic wheel load of $15\text{ kN}$, the loaded axle height above a flat concrete surface is $0.69\text{ m}$. Calculate the radial tire deflection in $\text{mm}$.

Answer Key:

60

Step-by-Step Solution & Explanation

Unloaded tire radius: $r_0 = \frac{D}{2} = \frac{1.50}{2} = 0.75\text{ m} = 750\text{ mm}$ Loaded static axle radius $r_s = 0.69\text{ m} = 690\text{ mm}$. Tire radial deflection $\delta$: $\delta = r_0 - r_s = 750 - 690 = 60\text{ mm}$
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