Agricultural/Bioengineering Farm Machinery 2 — Questions and Answers
Question 1: What is the primary function of a PTO (Power Take-Off) on a tractor?
- To steer the tractor
- To transfer engine power to attached implements (Correct answer)
- To control hydraulic pressure
- To engage the four-wheel drive
Correct answer: To transfer engine power to attached implements
The PTO shaft transfers rotational power from the tractor engine to implements such as mowers, balers, and augers.
Question 2: Which tillage implement is designed to break up hardpan soil layers below normal plow depth?
- Disc harrow
- Field cultivator
- Chisel plow
- Subsoiler (Correct answer)
Correct answer: Subsoiler
A subsoiler uses narrow shanks to fracture compacted layers (hardpan) at depths of 18–36 inches without inverting the soil.
Question 3: On a grain combine, what component separates grain from the chaff using air flow?
- Concave
- Cleaning shoe (Correct answer)
- Threshing cylinder
- Feeder house
Correct answer: Cleaning shoe
The cleaning shoe uses fans and sieves to blow chaff away while heavier grain falls through to the clean grain elevator.
Question 4: A center-pivot irrigation system covers a field in what geometric shape?
- Square
- Rectangle
- Circle (Correct answer)
- Hexagon
Correct answer: Circle
Center-pivot systems rotate around a fixed central point, irrigating a circular area that can range from 40 to over 500 acres.
Question 5: What does 'drawbar horsepower' measure on a tractor?
- Total engine output
- Power available at the PTO shaft
- Actual pulling power delivered at the hitch (Correct answer)
- Hydraulic system capacity
Correct answer: Actual pulling power delivered at the hitch
Drawbar horsepower is the usable pulling power at the tractor's hitch, accounting for drivetrain losses and traction efficiency.
Question 6: Which planter component meters and delivers individual seeds at precise spacing?
- Press wheel
- Seed tube
- Seed meter (Correct answer)
- Furrow opener
Correct answer: Seed meter
The seed meter (or metering unit) singulates seeds and controls the rate at which they are released into the seed tube.
Question 7: In sprayer calibration, if a nozzle delivers 10 oz of water in 30 seconds and the target is 15 oz, what should you do?
- Increase travel speed
- Decrease system pressure
- Increase system pressure or use a larger nozzle (Correct answer)
- Reduce nozzle spacing
Correct answer: Increase system pressure or use a larger nozzle
Higher pressure or a larger orifice nozzle increases flow rate to reach the desired output volume.
Agricultural/Bioengineering Farm Machinery 2
What is the primary function of a PTO (Power Take-Off) on a tractor?