Question Bank • QB_FP_074 MCQ • 1 Mark

Section 3: Farm Power

Tractors and Power Tillers

Subtopic: Traction theory

Question Statement:

For maximum tractive efficiency and optimal fuel economy on tilled agricultural soils, the recommended operational wheel slip range is:

Options:

  • (A) $10\% - 15\%$ for 2WD tractors, and $8\% - 12\%$ for 4WD tractors
  • (B) $0\% - 2\%$ for all tractors
  • (C) $35\% - 50\%$
  • (D) Greater than $60\%$

Answer Key:

A

Step-by-Step Solution & Explanation

Tractive efficiency curves show that at very low slip (<5%), rolling resistance dominates, while at high slip (>20%), energy wasted in soil churning escalates. The peak of tractive efficiency occurs at 10–15% slip for 2WD tractors and 8–12% for 4WD tractors on firm-to-tilled agricultural fields.
← Previous (QB_FP_075) Next (QB_FP_072) →

Practice In Authentic CBT Exam Interface

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

Launch CBT Mock Test