Agricultural/Bioengineering Farm Machinery 3 — Questions and Answers
Question 1: What is the purpose of a no-till drill compared to a conventional grain drill?
- It plants at higher speeds
- It cuts through crop residue to place seed without prior tillage (Correct answer)
- It applies fertilizer at twice the rate
- It only works in sandy soils
Correct answer: It cuts through crop residue to place seed without prior tillage
No-till drills use coulters and opener blades to cut through surface residue and place seed directly into undisturbed soil.
Question 2: Which factor most directly determines the 'effective field capacity' of a harvesting machine?
- Engine horsepower
- Field efficiency and operating width (Correct answer)
- Fuel tank size
- Number of operators
Correct answer: Field efficiency and operating width
Effective field capacity (ac/hr) equals theoretical capacity multiplied by field efficiency, accounting for turns, delays, and overlaps.
Question 3: A moldboard plow is best suited for which soil condition?
- Heavy crop residue fields requiring soil inversion (Correct answer)
- Fields with existing irrigation infrastructure
- Soils with zero compaction issues
- Sandy soils with low organic matter
Correct answer: Heavy crop residue fields requiring soil inversion
The moldboard plow inverts the soil profile, burying surface residue and weeds, making it ideal for fields with heavy crop debris.
Question 4: What is the role of a crop divider on a corn header?
- It cuts the stalks
- It guides standing stalks into the row units (Correct answer)
- It strips the husks
- It conveys ears to the feeder house
Correct answer: It guides standing stalks into the row units
Crop dividers are pointed shields between row units that separate and guide corn stalks into the stalk rolls and gathering chains.
Question 5: Which hydraulic system type on modern tractors provides flow only when an implement demands it, saving fuel?
- Open-center system
- Closed-center load-sensing system (Correct answer)
- Gravity-fed system
- Single-acting system
Correct answer: Closed-center load-sensing system
Closed-center load-sensing (LS) hydraulics vary pump output to match actual demand, reducing energy waste at low or zero flow conditions.
Question 6: When a round baler's net wrap runs out mid-field, what is the immediate operational consequence?
- The bale is ejected automatically
- The bale may unravel when ejected (Correct answer)
- The baler shuts down the engine
- Twine wrapping activates automatically
Correct answer: The bale may unravel when ejected
Without net or twine wrap completed, the bale lacks structural integrity and may loosen or fall apart when the tailgate opens.
Question 7: What is 'header loss' in combine harvesting?
- Grain lost through the cleaning shoe
- Grain dropped or shattered before entering the machine (Correct answer)
- Fuel wasted during field turns
- Grain lost through the unloading auger
Correct answer: Grain dropped or shattered before entering the machine
Header loss refers to grain that falls to the ground from shattering, lodging, or improper reel speed before it enters the feeder house.
Agricultural/Bioengineering Farm Machinery 3
What is the purpose of a no-till drill compared to a conventional grain drill?