A tractor pulls 8 kN drawbar load against 4 kN rolling resistance. If the tractor develops 57% tractive efficiency, the slip experienced by the tractor in percentage will be __________.
Official Answer Key:
14 to 15
Step-by-Step Solution & Explanation
• Axle pull required = drawbar pull + rolling resistance = 8 + 4 = 12 kN (the axle must both pull the load and overcome its own rolling resistance).
• Tractive efficiency, TE = (drawbar power)/(axle power) = (Drawbar pull/Axle pull) × (1 – slip).
• 0.57 = (8/12) × (1–s) = 0.6667(1–s) ⇒ (1–s) = 0.855 ⇒ s = 0.145 = 14.5%, inside the accepted range 14–15.
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