Allied & ICAR Exam Bank • ALLIED_1076 NAT • 2 Marks

Section 2: Farm Machinery

Farm Machinery

Subtopic: Spraying and Plant Protection

Question Statement:

A knapsack sprayer has a flat fan nozzle delivering 0.6 L/min at 200 kPa. If the operator walks at 3.0 km/h with an effective swath width of 0.75 m, the chemical mixture applied in L/ha is:

Answer Key:

160

Step-by-Step Solution & Explanation

Forward speed $v = 3.0\text{ km/h} = 50\text{ m/min}$. Area covered per minute $= 50\text{ m/min} \times 0.75\text{ m} = 37.5\text{ m}^2/\text{min}$. Application rate $= \frac{0.6\text{ L/min}}{37.5\text{ m}^2/\text{min}} \times 10,000\text{ m}^2/\text{ha} = 160\text{ L/ha}$.
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