Allied & ICAR Exam Bank • ALLIED_0205 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 positive displacement piston pump on an orchard sprayer delivers $60\text{ L/min}$ at $2.0\text{ MPa}$ operating pressure. If pump mechanical efficiency is $80\%$, the required driving power in kW is:

Answer Key:

2.5

Step-by-Step Solution & Explanation

Hydraulic power $P_h = Q \times \Delta P = \left(\frac{60 \times 10^{-3}}{60}\right) \times 2.0 \times 10^6 = 10^{-3} \times 2.0 \times 10^6 = 2000\text{ W} = 2.0\text{ kW}$. Brake power $= 2.0 / 0.80 = 2.5\text{ kW}$.
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