Question Bank • QB_FM_093 NAT • 2 Marks

Section 2: Farm Machinery

Farm Machinery

Subtopic: Calculation of performance parameters – field capacity, efficiency, performance index, application rate and losses

Question Statement:

A flat fan hydraulic spray nozzle delivers $1.2\text{ L/min}$ at an operating pressure of $250\text{ kPa}$. If the system pressure is increased to $400\text{ kPa}$, calculate the new discharge rate in $\text{L/min}$.

Answer Key:

1.518

Step-by-Step Solution & Explanation

Discharge of hydraulic spray nozzle is proportional to square root of operating pressure: $\frac{q_2}{q_1} = \sqrt{\frac{P_2}{P_1}}$ $q_2 = 1.2 \times \sqrt{\frac{400}{250}} = 1.2 \times \sqrt{1.6} = 1.2 \times 1.2649 = 1.518\text{ L/min}$
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