Ag Mech CDE 2019

Machinery: Approximately how many acres are in a rectangular field measuring 5,040 meters by 4,867 yards? 1 acre = 43, 560 square feet 1 hectare = 2.47 acres 1 acre = 0.4045 HectaresArea of Rectangle = length xwidth 1 mile = 5,280 feet 1 foot = 0.3048 meter

Electrical: A variety of incandescent lights are all operating on a single 120-volt electrical circuit in a livestock barn. The circuit includes two 200-watt lights, four 100-watt lights, and five 60-watt lights. What is the amperage of the circuit with all of these lights operating? Total Wattage = Voltage x Amperage

Compact Equipment: A 100 horsepower six-cylinder engine is operating at 5,400 feet above sea level. What approximate horsepower can be produced by the engine ifthe engine’s power is reduced 1.5 percent for each 1000 feet of elevation above sea level?

Structural: Steel angle iron is sold for $1.16 per linear foot, steel rod is sold for 88 cents per linear foot, and steel pipe is sold for $2.44 per linear foot. If 25.8 feet of angle iron, 19 feet of rod, and 231 inches of pipe are purchased, and 7% taxes are paid with the purchase, what is the approximate total price for the metal?

Environmental: A rectangular shaped plastic hopper is used to transport granular pesticide in bulk. This hopper is transported on a trailer with a 4,500-pound maximum load carrying capacity in addition to the weight of the hopper. The internal dimensions of the hopper are 7.75 feet wide, 11.75 feet long and 5.25 feet deep. What is the maximum weight in pounds per cubic foot (approximate value) that granular pesticide can weigh, completely fill the hopper, and still transport within safe load carrying limits? 1 gallon = 231 cubic inches 1 cubic-foot = 1728 cubic-inches Volume of rectangular prism= Length x Width x Height

Environmental: If a center pivot irrigation system is 0.25 mile long (has a 0.25 mile radius), approximately how many acres can be irrigated under 270 degrees of the pivot's travel? Area of a circle= (π) x (radius)2 π = 3.14 diameter = 2 x radius 1 acre = 43,560sq ft 1 mile = 5,280 feet

Machinery: Each cylinder in a six cylinder tractor engine has a bore (diameter)of 4.56inches and a piston stroke of 6.45 inches. What is the approximate total displacement of this engine in liters? Area of a cylinder bore = (π) x(radius)2 π = 3.14 radius = (diameter÷2) Volumetric displacement of a single cylinder = (length of piston stroke) x (the area of the cylinder bore) 1 liter = 61 cubic inches 1 cubic inch = 0.0164 liter

Electrical: The interior electrical lighting of a farm structure is being replaced with high efficiency lighting. The 36 incandescent, 150-Watt lights will be replaced with 24 LED, 60-Watt lights. If the lights are operated 105 hours each month and electricity cost 11.74 cents per kilowatt-hour (kWh), what is the approximate reduction in electrical power costs each month? 1000 Watts = 1 kilowatt

Compact Equipment: Which of the following will have the lowest weight in pounds: 5.47gallons of gasoline, 4.97gallons of diesel, 4.71 gallons of 15W-40 engine oil, or 4.72 gallons of automatic transmission fluid? 1 gallon of gasoline =6.3 pounds 1 gallon of diesel = 6.943pounds 1gallon 15W-40 engine oil = 7.3 pounds 1 gallon automatic transmission fluid = 7.298 pounds

Structural: Which of the following quantities of lumber has the greatest number of board-feet? 1 board-foot =144 cubic inches 1 square foot = 144 square inches

Structural: The round support column (cylinder) ina building is a vertical steel pipe with an outside diameter of 36 inches. The pipe has a wall thickness of 1/2” and will be filled with concrete. If the 18-foot tall pipe is to be completely filled, approximately how many cubic-yards of concrete are needed? Volume of cylinder = (π) x (radius)2 x height π = 3.14 radius = (diameter ÷2) 27 cubic feet = 1 cubic yard

Environmental: A tractor fueled by No. 2 diesel burns 8.45gallons per hour. When the same tractor is fueled with B20 biodiesel it burns 75 gallons of fuel in eight hours. Approximately what percentage does the gallons of fuel per hour(consumption) increase when the tractoris fueled by B20 biodiesel rather than No. 2 diesel?

Machinery: What is the approximate speed, in miles per hour, for a fertilizer spreader that travels 115 meters in 1 minute and 9 seconds?5,280 ft = 1 mile 60 seconds = 1 minute 60 minutes = 1 hour 1 foot = 0.3048 meter

Electrical: A 240-volt air conditioning unit uses 124 kwh of power during 24 hours of operation. What is the approximate size of this air conditioning unit in tons of refrigeration (disregard efficiency)? One ton of air conditioning removes heat at the rate equivalent to melting one ton of ice during a period of 24 hours. Information: British Thermal Unit (BTU): 3412.14BTUs = 1 kilowatt hour 1 Ton of Refrigeration = 12,000 BTUs / hour(the rate of heat removal)

Compact Equipment: An engine manual requires each head bolt to be torqued to 16Newton meters (Nm) during reassembly. The torque wrench available is calibrated in foot pounds (ft. lbs.). What approximate torque in ft. lbs. is equivalent to 13Nm? 4.44822 Newtons = 1 pound force 0.22481 pound force= 1 Newton 1 meter = 3.28084 feet 1 foot = 0.3048 meters