MSYM 232 Power and Machinery Principles Solve the following problems on Engineers Pad Paper using the problem solving format for this class. Show your work. Show: concept equations; variable...

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MSYM 232 Power and Machinery Principles Solve the following problems on Engineers Pad Paper using the problem solving format for this class. Show your work. Show: concept equations; variable descriptions with given data; algebra, calculations, and units; your answers labeled and identified, and cite any references used in your problem solutions. Remember to communicate your method of solving these problems clearly and effectively using the problem solving format (you can skip the problem statement part, except for showing the problem number). Scan this page and your solutions to these problems in a file and upload the file into part 3 of this exam in Canvas. These problems are 20 points each. 1. A four-wheel drive tractor weighing 43,325 lb is operating in a level field with firm soil. The wheel slip is determined to be 14.5%. What draft (pull force), rolling resistance force, and tractive efficiency would the equations in the ASABE D497.7 standard predict for the tractor in this operation? (Hint: tractor ballasting?) 2. As the farm machinery manager, Juanita is planning a spray operation to spray Roundup on Roundup-ready soybeans to control annual grasses and broadleaf weeds. She studies the Roundup label and learns that the concentrated product contains 4 lb of active ingredient per gallon of concentrate, and the recommended application rate is 4 lb of active ingredient per acre. She knows the nozzle spacing on the sprayer is 20 inches and she wants the sprayer to travel at 6.5 mph. She decides to use a ratio of 39 gallons of water per gallon of concentrate. What nozzle flowrate (gal/min·nozzle) should Juanita use to select an appropriate combination of nozzle size and sprayer pressure? 3. Olufemi is analyzing a windrowing operation in a field he plans to have harvested in a back-andforth pattern with rows 768 m long, after the windrower has made two circuits around the outside of the field to open up the headlands, leaving a 390 m ft width of crop in the field. Olufemi has a skilled operator so he expects the machine width utilization factor to be 0.97 (machine width is 6.10 m) and a travel speed of 12.1 km/h, taking 12 s at each end of the field to make the turn and resume windrowing. He also plans that the operator will take 5 minutes out of every 2 hours to stretch, walk around the machine to inspect for problems and make any necessary adjustments. If there are no breakdowns, how long should Olufemi expect his operator to take to windrow the crop in the field (not including the two circuits to open the headlands)? Conversion factors: 1.000 ha = 104 m2 12.00 in = 1.00 ft 1.000 acre = 43,560 ft2 1.00 mile = 5280 ft 1.000 km = 103 m 231 in3 = 1.00 gal
Jan 19, 2021
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