Question: Q.10 A General Contractor utilizes a 20 CY dump trucks to haul excess excavated material. The truck is powered with a 200 HP four-cycle naturally

Q.10

A General Contractor utilizes a 20 CY dump trucks to haul excess excavated material. The truck is powered with a 200 HP four-cycle naturally respirated engine and the gear train efficiency is 0.85. The site is at 3,000 ft elevation. The gross weight of a fully-loaded truck is 45 tons with 65% carried by the rear (driving) wheels. Haul road is at 5% grade with tire penetration of 1.5 inch. The coefficient of traction is 0.65. The performance data is shown in the table below. 1. Determine the adjusted available rimpull of the truck in each of the indicated gears. 2. What will be the maximum speed for the truck? Gear Speed (mph) 1 3 2 2. 10 3 15 4 4 24

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