1. A wheel tractor has a 200 HP engine. Calculate the available rimpull of this tractor if it is operating at an altitude of 1,000 m. above sea level, at an average temperature of 25oC, and at an average speed of 12 km/hr. Take rimpull efficiency as 85%
1. A wheel tractor has a 200 HP engine. Calculate the available rimpull of this tractor
if it is operating at an altitude of 1,000 m. above sea level, at an average
temperature of 25oC, and at an average speed of 12 km/hr. Take rimpull efficiency
as 85%.
2. The weight of the wheel tractor in Problem 1 is 30 tons and the weight on the driving
wheels is 50% of this weight. What is the maximum available rimpull if the
coefficient of traction is 0.25?
3. What is the maximum grade that the tractor in Problems 1 and 2 can climb if it is
moving on a surface with a rolling resistance of 150 kg/ton?
4. Assume that the tractor in Problems 1, 2, and 3 is moving down a 8% grade. How
many minutes are necessary to accelerate to the average speed of 5 km/hr in first
gear? Use a rimpull reduction factor of 75% in your calculations.
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