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A two-wheel drive tractor is pulling a load of 12 KN horizontally on levelled surface at forward speed of 5km/hr. The rolling radius of traction wheel and wheel slip are 0.65m and 20% respectively. If rear axle torque is 9KNm the tractive efficiency is ______

(a) 69.31%

(b) 23.90%

(c) 51.49%

(d) 10.24%

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Enquiry is from Traction and Traction Theory topic in chapter Farm Tractor of Farm Machinery

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The correct choice is (a) 69.31%

Easiest explanation: Slip, Vt – Va = 0.20 Vt

0.80 Vt = Va

Vt = \(\frac{V_a}{0.80}\) = 1.736 ms^-1

η = \(\left[\frac{12*\frac{25}{18}}{\frac{9}{0.65}*1.736}\right] = \frac{16.66}{24.036}\) = 69.31%

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