Ag Mech 2024 National Exam

Machinery: The John Deere 6M series 105HP utility tractor is equipped with an AutoPower/IVT transmission-hydraulic system that requires a fluid change at 1500 hours. The fluid capacity for the system is 60 liters. As a dealership manager, you have four tractors to service. Which purchase option is the least expensive with the least amount of fluid left over?

1 liter = 0.264172 gallon. One gallon = $26. Five Gallon Container=123.00. Fifty-five Gallon Drum = $1,247.

• (1) fifty-five-gallon barrel and (9) one-gallon containers

• (2) fifty-five-gallon barrel

• (1) fifty-five-gallon barrel, (1) five-gallon container, and (4) one-gallon containers

• (12) five-gallon containers and (1) one-gallon container

A technician needs to install an electronic device to determine the volumetric output of a water pump operating a center pivot irrigation system. What device does the technician install?

• temperature sensor

• flow sensor

• pressure sensor

• photoelectric sensor

When using a bench grinder safely, what is the maximum tool rest spacing?

• 1/8”

• 1/4”

• 1/2”

• 3/4”

            Structural: A large pasture needs to be sectioned into four smaller equal-sized square fields to allow for rotational grazing. The dimensions of the pasture include a length of 4350 feet and a width of 3582 feet. Three strands of four-point barb wire will be installed. Wire costs $120 per roll. Each roll has 1,320 feet of wire. Tax is 6.5% of the purchase price. Assume that you will need an additional 10% wire for any errors. A single 16-foot gate will be installed for the main pasture perimeter and a 16-foot gate for each of the four sections to allow livestock to rotate. No wire is needed where gates are installed. What is the cost of the barbed wire, including tax, for the project?

• $ 4,474.96

• $ 5,493.00

• $ 6,524.00

• $ 7,668.00

Environmental: During the silking stage, a corn variety has an evapotranspiration rate of 0.32 inches per day. The sandy loam soil has an available water storage capacity of 2.1 inches. The farmer would like to know when to schedule the next irrigation. How long (in days) will it take before the crop exhibits stress due to insufficient moisture?

• 4.0 days

• 6.5 days

• 7.5 days

• 8.0 days

Using the NFPA symbol to the right, what is the level of health hazard for the fertilizer?

• 0

• 1

• 3

• 4

For a hydraulic system, what is the result when a constant fluid flow rate encounters a reduction in the diameter of a hose?

• Increase in fluid pressure

• Decrease in fluid pressure

• Decrease in fluid velocity

• Decrease in flow rate

• $52.92

• $62.92

• $92.87

• $158.77

You have been asked to fabricate an engine mounting bracket. What is the approximate tap-drill bit size to make a 1/4-28 threaded hole? Tap-drill bit size = major diameter – (1 ÷ number of threads per inch)

• 0.123”

• 0.214”

• 0.234”

• 0.250”

What is the common name for the layout tool provided in the picture below?

• Plumb Bob

• Plate Level

• Line Level

• Carpenter’s Level