Allied & ICAR Exam Bank • ALLIED_1104 NAT • 2 Marks

Section 3: Farm Power

Farm Power

Subtopic: Tractor Dynamics and Weight Transfer

Question Statement:

A 2WD tractor has a total weight of 24 kN with a wheelbase of 2.0 m. The center of gravity is located 0.7 m ahead of the rear axle at a height of 0.8 m above ground. If the tractor exerts a horizontal drawbar pull of 6 kN at a drawbar hitch height of 0.4 m above ground on level terrain, the dynamic weight on the rear axle (in kN) is:

Answer Key:

16.8

Step-by-Step Solution & Explanation

Static rear axle weight $W_{rs} = W \times \frac{x_f}{L} = 24 \times \frac{2.0 - 0.7}{2.0} = 24 \times \frac{1.3}{2.0} = 15.6\text{ kN}$. Dynamic weight transfer from drawbar pull $\Delta W = \frac{P \times h_d}{L} = \frac{6 \times 0.4}{2.0} = 1.2\text{ kN}$. Dynamic rear axle weight $W_{rd} = W_{rs} + \Delta W = 15.6 + 1.2 = 16.8\text{ kN}$.
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