Allied & ICAR Exam Bank • ALLIED_0860 NAT • 2 Marks

Section 3: Farm Power

Farm Power

Subtopic: Tractors and Power Tillers

Question Statement:

A tractor three-point hitch hydraulic system has lift cylinder piston diameter $d = 80\text{ mm}$ (area $A = \frac{\pi}{4}(0.08)^2 \approx 0.0050265\text{ m}^2$). Working relief valve hydraulic pressure is $P = 18\text{ MPa}$ ($1.8 \times 10^7\text{ N/m}^2$). The maximum thrust force exerted by the piston $F = P \cdot A$ in kN is (rounded off to one decimal place):

Answer Key:

90.5

Step-by-Step Solution & Explanation

$F = 1.8 \times 10^7 \times 0.0050265 = 90,477\text{ N} \approx 90.5\text{ kN}$.
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