30 Questions
What is the power range of the industrial engine that powers a self-propelled combine?
60 to 150 hp
What type of loss occurs when grain is lost due to rough handling by the cutter bar?
Cutter Bar Loss
What is the role of snapping rolls in a corn harvester?
To remove the ears from the standing stalks
What is Header Loss in grain harvesting, and how can it be minimized?
Header Loss is the loss of good grains shattered during cutting and transporting. It can be minimized by avoiding sharp turns while cutting and reducing cutting speed when harvesting shattering varieties.
What is the difference between a Pull-type and Self-Propelled corn picker?
The power unit, with Pull-type being driven by a tractor and Self-Propelled being driven by an industrial engine
What is Crop Damage Loss, and how does it occur during harvesting?
Crop Damage Loss is the loss of unrecoverable good grains that are available from standing crops knocked down or damaged by the machine during cutting. It occurs when the harvesting machine damages the standing crop during the cutting operation.
What is the function of a husker attachment in a corn picker?
To remove the husk
How does a Stripper Harvester work, and what are its advantages?
A Stripper Harvester strips the grain from the panicle using a combing action, without cutting the panicle. Its advantages include simplicity, ease of construction, and robustness of the rotor.
What is the term for grain lost out of the rear of the combine in the form of threshed grain?
Separating Loss
What are the functions of a Combine Harvester, and what types of crops can it harvest?
A Combine Harvester heads the standing grain, threshes it, and cleans it as it moves over the field. It can harvest small grains, soybeans, grain sorghum, rice, and many others.
What is the difference between a Pull-Type Combine and a self-propelled Combine Harvester?
A Pull-Type Combine is drawn by a tractor and powered through the power take-off shaft, whereas a self-propelled Combine Harvester has an auxiliary engine.
How does a Combine Harvester simplify the harvesting process, and what activities does it eliminate?
A Combine Harvester simplifies the harvesting process by eliminating the need for a grain binder, header, stationary thresher, and stacking and hauling activities.
What are the characteristics of a suitable corn variety for machine harvesting?
Stiff stalks that stand up and do not break or lodge, suitable ear height and stalks, tough ear shanks, and hard shelling characteristics
What is the importance of timeliness in corn harvesting?
Timely harvesting reduces field losses.
What is the main cause of Shelled Corn Loss during harvesting?
Shelling occurring at the snapping roll
What is the purpose of adjusting the dividers on a corn picker?
To pick up stalks that are down
Why is a clean field important for corn harvesting?
To facilitate easy harvesting and reduce losses
What is the advantage of having a thick, tight husk on the ear?
It is desirable for snapping but not husking
What is the name of the machine used for harvesting cotton?
cotton stripper
What are the two types of cotton stripper machines?
Double Roller and Multiple Finger or Comb-Type
What are the factors that affect the performance of cotton stripper?
Plant characteristics, thickness of plant in row, cultural practices, pick-up fingers or limb lifters, design of stripping unit, conveying system, and rate of travel
What is the advantage of using a forage harvester in terms of feeding value?
Provides more uniformity of feeding value from any part of silo
What is the benefit of using a forage harvester in terms of crop preservation?
Leaves no mud or contaminating soil bacteria on butts
What is the advantage of using a forage harvester in terms of silo filling?
Permits filling the silo when the crop is at the right stage
What is the purpose of a root harvester, and what are some common applications of this machine?
The purpose of a root harvester is to dig and separate the roots of the crop from the soil. Common applications of root harvesters are for potatoes, beets, peanuts, sweet potatoes, and many others.
What is the formula to calculate the theoretical field capacity of a harvester, and what factors affect this calculation?
The formula to calculate the theoretical field capacity is 0.1 x header width (m) x machine velocity (kph). The factors that affect this calculation are the header width and machine velocity.
What is the difference between theoretical field capacity and effective field capacity, and how is the latter calculated?
Theoretical field capacity is the maximum capacity of a harvester, while effective field capacity is the actual capacity considering field efficiency. Effective field capacity is calculated by multiplying the theoretical field capacity by the field efficiency.
What is the formula to calculate the power requirement of a harvester, and what factors affect this calculation?
The formula to calculate the power requirement is specific draft x number of rows or specific power x header width. The factors that affect this calculation are specific draft, number of rows, and header width.
A 6-meter harvester is harvesting corn at a rate of 100 kg per minute. If the effective width of the machine is 90% of its width, and it runs at a speed of 2.5 kph, what is the effective field capacity and harvesting rate of the machine in tons per hectare?
Effective field capacity = 0.1 x 6 x 2.5 x 0.9 x 0.7 = 0.945 ha/h. Harvesting rate = 100 kg/min x 60 min/h = 6 tons/h. Harvesting rate per hectare = 6 tons/h / 0.945 ha/h = 6.35 tons/ha.
A combine harvester with a 2.5-meter wide effective width passes the field at a speed of 5 kph. If the field efficiency of the machine is 80%, what is the field capacity of the harvester?
Theoretical field capacity = 0.1 x 2.5 x 5 = 1.25 ha/h. Field capacity = 1.25 ha/h x 0.8 = 1 ha/h.
Learn about the different types of harvesting losses in reaper machines, including header loss and crop damage loss, and ways to reduce these losses. This quiz is ideal for agronomy students and farming professionals.
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