CM 2113 FINAL EXAM - WANG QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026

CM 2113 FINAL EXAM - WANG QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026 Usable power depends on project conditions—primarily, haul-road surface condition, altitude, and temperature. Underfoot conditions determine how much of the available power can be transferred to the surface to propel the machine. - Answers true The coefficient of traction can be defined as the factor by which the total weight of the equipment should be multiplied to determine the maximum possible tractive force between the wheels or tracks and the surface just before slipping will occur. - Answers false Assume that a rubber-tired tractor has a total weight of 25,000 lb on its driving wheels. The maximum rimpull in low gear is 9,000 lb. If the tractor is operating in wet sand, with a coefficient of traction of 0.30, what is the maximum possible rimpull prior to slippage of the tires? (See Example 6.5 in the textbook for reference) - Answers 7500 lb Continue with the previous question, will this tractor slip on this surface? - Answers yes Assume that a rubber-tired tractor has a total weight of 25,000 lb on its driving wheels. The maximum rimpull in low gear is 9,000 lb. If the tractor is operating in wet sand, with a coefficient of traction of 0.60, what is the maximum possible rimpull prior to slippage of the tires? - Answers 15000 lb Continue with the previous question, will this tractor slip on this surface? - Answers no A wheel tractor scraper is used on a road project. When the project begins, the scraper will experience high rolling and grade resistance at one work area. The rimpull required to maneuver in this work area is 65,000 lb. In the fully loaded condition, 48% of the total vehicle weight is on the drive wheels. The fully loaded vehicle weight is 189,360 lb. Please calculate how much weight is on the drive wheels. (See Example 6.6 in the textbook for reference) - Answers 90,893 lb Continue with the previous question, what minimum value of coefficient of traction between the scraper wheels and the traveling surface is needed to maintain maximum possible travel speed? - Answers .72 Dozer is good for applications of less than 300ft short haul, and scraper is good for applications of up to 3,000ft medium haul. - Answers true An advantage of a crawler dozer as compared with a wheel-type dozer is higher speed. - Answers false Which of the following work tasks can be performed by a dozer? - Answers all of the above The ________________ is very effective for side-casting material, particularly for backfilling or making sidehill cuts. - Answers angle blade ______________ is a technique whereby the blade end spillage from the first pass or the sidewalls from previous cuts are used to hold the material in front of the dozer blade on subsequent passes. - Answers slot dozing Which of the following factors need to be considered when selecting a proper scraper for your project? - Answers all of the above Please match the following three methods of pushing loading scrapers with their corresponding diagrams? - Answers back-track loading shuttle loading chain loading Articulated trucks consist of two individual frames joined by pin, and can be easily operated over soft ground. - Answers true A contractor wants to investigate the production and cost differences of using a 4S blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a distance of 150 ft from the beginning of the cut. The dozing is uphill on a 20% grade. The operator will have average skill. The site conditions will be dark for visibility. The material weighs 108 pcf in the bank state. Job efficiency is assumed to be equivalent to a 50-min hour. What is the operator correction factor? - Answers .75 A contractor wants to investigate the production and cost differences of using a 4S blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a distance of 150 ft from the beginning of the cut. The dozing is uphill on a 20% grade. The operator will have average skill. The site conditions will be dark for visibility. The material weighs 108 pcf in the bank state. Job efficiency is assumed to be equivalent to a 50-min hour. What is the material-weight correction factor? Assume the percent swell is 12%. - Answers .88 A contractor wants to investigate the production and cost differences of using a 4S blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a distance of 150 ft from the beginning of the cut. The dozing is uphill on a 20% grade. The operator will have average skill. The site conditions will be dark for visibility. The material weighs 108 pcf in the bank state. Job efficiency is assumed to be equivalent to a 50-min hour. What is the visibility correction factor? - Answers .80 A contractor wants to investigate the production and cost differences of using a 4S blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a distance of 150 ft from the beginning of the cut. The dozing is uphill on a 20% grade. The operator will have average skill. The site conditions will be dark for visibility. The material weighs 108 pcf in the bank state. Job efficiency is assumed to be equivalent to a 50-min hour. What is the work efficiency correction factor? - Answers .83 A contractor wants to investigate the production and cost differences of using a 4S blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a distance of 150 ft from the beginning of the cut. The dozing is uphill on a 20% grade. The operator will have average skill. The site conditions will be dark for visibility. The material weighs 108 pcf in the bank state. Job efficiency is assumed to be equivalent to a 50-min hour. What is the grade correction factor? Please choose a range from the following where your reading will be within. - Answers .4 - .6 A contractor is planning to use single pusher scrapers to move 90,000 cubic yards of soil, and the expected production of a single pusher scraper assuming adequate pusher support is 230cy/hr. It has been decided there will be total 8 scrapers operating on the site with a back-track loading method. The estimated cycle time for each scraper is 7.5 min. How many pushers are required to serve the fleet of 8 scrapers? - Answers 2 A contractor is planning to use single pusher scrapers to move 90,000 cubic yards of soil, and the expected production of a single pusher scraper assuming adequate pusher support is 230cy/hr. It has been decided there will be total 8 scrapers operating on the site with a back-track loading method. The estimated cycle time for each scraper is 7.5 min. Following the previous question, what is the expected production rate of this scraper fleet if only one pusher is available? - Answers 1,150 cy/hr A contractor has a project involving the construction of a small manufacturing plant. The contractor has selected a borrow site and has decided to use 27-cubic yard dump trucks to haul the needed fill material. The contractor has decided to use a hydraulic excavator with a shovel attachment to load the trucks. The excavator has expected productivity as 422cy/hr at 100% efficiency, and the truck cycle time excluding loading is 0.48hr. The job site operation efficiency is assumed as 0.8. How many dump trucks will be needed to work with the excavator? - Answers 9 A contractor has a project involving the construction of a small manufacturing plant. The contractor has selected a borrow site and has decided to use 27-cubic yard dump trucks to haul the needed fill material. The contractor has decided to use a hydraulic excavator with a shovel attachment to load the trucks. The excavator has expected productivity as 422cy/hr at 100% efficiency, and the truck cycle time excluding loading is 0.48hr. The job site operation efficiency is assumed as 0.8. Please answer the next two questions. What is the expected fleet production if only 6 trucks are available to the fleet? - Answers 238 cy/hr A contractor has a project involving the construction of a small manufacturing plant. The contractor has selected a borrow site and has decided to use 27-cubic yard dump trucks to haul the needed fill material. The contractor has decided to use a hydraulic excavator with a shovel attachment to load the trucks. The excavator has expected productivity as 422cy/hr at 100% efficiency, and the truck cycle time excluding loading is 0.48hr. The job site operation efficiency is assumed as 0.8. Please answer the next two questions. What is the expected fleet production if 11 trucks are available to the fleet? - Answers 338 cy/hr Which of the following is not a disadvantage of a crawler crane? - Answers limited capacity Using Fig. 17.13, select the minimum-length boom required to hoist a load of 80,000 lb from a truck at ground level and place it on a platform 76 ft above the ground. The minimum allowable vertical distance from the bottom of the load to the boom point of the crane is 42 ft. The maximum horizontal distance from the center of rotation of the crane to the hoist line of the crane when lifting the load is 40 ft. - Answers 120 ft A 25-ton truck-mounted hydraulic crane is being used on a construction site. The maximum horizontal distance from the center of rotation of the crane to the hoist line of the crane when lifting a load of