The nature of variation of tractive efficiency (TE) with wheel slip (S) in a rear wheel driven tractor is shown as
Options:
(A) curve rising then falling (peaked)
(B) curve falling then rising
(C) monotonically decreasing curve
(D) monotonically increasing curve
Official Answer Key:
A
Step-by-Step Solution & Explanation
Tractive efficiency is the ratio of drawbar power to axle power. At very low slip, efficiency starts low (rolling-resistance losses dominate net pull); as slip increases from zero, TE rises rapidly to a peak (typically around 8–15% slip for firm soils, higher for soft soils); beyond the peak, further slip wastes increasing power in wheel spin and TE declines steadily. This peaked (rise-then-fall) shape is the standard textbook curve; among the four sketches given in the original paper it corresponds to option (A).
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