Question Bank • QB_FM_086 NAT • 2 Marks

Section 2: Farm Machinery

Farm Machinery

Subtopic: Forces acting on a tillage tool

Question Statement:

A subsoiler tine operates at a depth of $45\text{ cm}$ with a forward speed of $3.6\text{ km/h}$. The measured horizontal draft is $14.5\text{ kN}$. Calculate the power required to pull the subsoiler in $\text{kW}$.

Answer Key:

14.5

Step-by-Step Solution & Explanation

Forward speed: $v = 3.6\text{ km/h} = \frac{3.6}{3.6} = 1.0\text{ m/s}$ Draft $D = 14.5\text{ kN} = 14500\text{ N}$. Drawbar power: $P = \frac{D \times v}{1000} = \frac{14500 \times 1.0}{1000} = 14.5\text{ kW}$
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