Question Bank • QB_FP_010 NAT • 2 Marks

Section 3: Farm Power

Tractors and Power Tillers

Subtopic: Tractor tests and performance

Question Statement:

A 2WD tractor exerts a drawbar pull of $12\text{ kN}$ while moving at a steady forward speed of $5.4\text{ km/h}$. If the mechanical power delivered by the engine to the rear axle is $24\text{ kW}$, the tractive efficiency of the tractor expressed in percentage is ________ (answer in integer).

Answer Key:

75

Step-by-Step Solution & Explanation

1. Convert forward velocity to $\text{m/s}$: $v = 5.4 \times \frac{5}{18} = 1.5\text{ m/s}$ 2. Calculate Drawbar Power ($P_{\text{db}}$): $P_{\text{db}} = \text{Pull} \times v = 12\text{ kN} \times 1.5\text{ m/s} = 18\text{ kW}$ 3. Tractive efficiency ($\eta_{\text{tr}}$): $\eta_{\text{tr}} = \frac{P_{\text{db}}}{P_{\text{axle}}} \times 100 = \frac{18\text{ kW}}{24\text{ kW}} \times 100 = 75\%$
← Previous (QB_FP_ADV_037) Next (QB_FP_084) →

Practice In Authentic CBT Exam Interface

Test your skills under authentic timed conditions with live scoring and AIR percentile ranking.

Launch CBT Mock Test