Allied & ICAR Exam Bank • ALLIED_1112 NAT • 2 Marks

Section 3: Farm Power

Farm Power

Subtopic: Traction Mechanics

Question Statement:

A tractor exerts a drawbar pull of 12 kN at a speed of 5.4 km/h (1.5 m/s). The axle power delivered to the drive wheels is 22.5 kW. The tractive efficiency of the tractor (in %) is:

Answer Key:

80.0

Step-by-Step Solution & Explanation

Drawbar power $DBP = F \times v = 12\text{ kN} \times 1.5\text{ m/s} = 18.0\text{ kW}$. Tractive efficiency $\eta_{tr} = \frac{DBP}{\text{Axle Power}} \times 100 = \frac{18.0}{22.5} \times 100 = 80.0\%$.
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