Agricultural/Bioengineering Farm Machinery 4 — Questions and Answers
Question 1: Which type of spray nozzle produces the flattest fan angle and is best for herbicide applications requiring soil incorporation?
- Air induction nozzle
- Flooding nozzle
- Flat-fan nozzle (Correct answer)
- Hollow-cone nozzle
Correct answer: Flat-fan nozzle
Flat-fan nozzles produce a uniform, thin spray pattern ideal for broadcast herbicide application with consistent coverage across the boom.
Question 2: On a tractor three-point hitch, Category II has a lower link pin diameter of approximately:
- 7/8 inch (22 mm)
- 1 inch (25 mm)
- 1-1/8 inch (28 mm) (Correct answer)
- 1-3/8 inch (35 mm)
Correct answer: 1-1/8 inch (28 mm)
ASABE standards define Category II three-point hitch lower link pins at 1-1/8 inch (28.6 mm) diameter, used on mid-size tractors of 45–130 hp.
Question 3: What is the primary advantage of GPS auto-steer on planting equipment?
- It increases engine horsepower
- It reduces row skips and overlaps, improving accuracy to sub-inch passes (Correct answer)
- It automatically adjusts seeding depth
- It eliminates the need for seed calibration
Correct answer: It reduces row skips and overlaps, improving accuracy to sub-inch passes
Auto-steer systems guide equipment along precise paths, eliminating human-error overlaps and skips that waste seed, fuel, and chemicals.
Question 4: In a grain elevator, what is the function of the 'boot' section?
- It controls the discharge spout
- It is the lower housing where grain enters the elevator belt (Correct answer)
- It drives the top pulley
- It measures grain moisture
Correct answer: It is the lower housing where grain enters the elevator belt
The boot is the bottom housing of a bucket elevator where grain is scooped up by the buckets attached to the moving belt or chain.
Question 5: Which maintenance interval is most commonly recommended for changing tractor engine oil under normal field conditions?
- Every 50 hours
- Every 250 hours (Correct answer)
- Every 1,000 hours
- Every 2,500 hours
Correct answer: Every 250 hours
Most modern tractor manufacturers specify engine oil changes every 250 operating hours under normal conditions, though dusty conditions may require shorter intervals.
Question 6: What is the purpose of a 'straw walker' in a conventional (non-rotary) combine?
- It feeds straw into the baler
- It separates remaining grain from straw using oscillating motion (Correct answer)
- It chops residue into the field
- It conveys cleaned grain to the tank
Correct answer: It separates remaining grain from straw using oscillating motion
Straw walkers use eccentric crankshaft motion to agitate straw, allowing any remaining loose grain to fall through to the cleaning system.
Question 7: A manure spreader set to a high application rate would typically indicate:
- Slower ground speed and wider beater spacing
- Higher ground speed and a smaller discharge opening
- Slower ground speed and a larger discharge opening (Correct answer)
- Higher ground speed with finer chopping
Correct answer: Slower ground speed and a larger discharge opening
Increasing application rate requires slowing travel speed and opening the discharge gate wider to release more material per acre.
Agricultural/Bioengineering Farm Machinery 4
Which type of spray nozzle produces the flattest fan angle and is best for herbicide applications requiring soil incorporation?