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5.1.1 Name and explain THREE factors that have an influence on the depth control system of a tractor - NSC Agricultural Technology - Question 5 - 2018 - Paper 1
Question 5
5.1.1 Name and explain THREE factors that have an influence on the depth control system of a tractor. 5.1.2 State THREE items on a tractor that the driver must insp... show full transcript
Worked Solution & Example Answer:5.1.1 Name and explain THREE factors that have an influence on the depth control system of a tractor - NSC Agricultural Technology - Question 5 - 2018 - Paper 1
Step 1
Name and explain THREE factors that have an influence on the depth control system of a tractor.
Answer
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Soil Resistance: On sandy soils, the plough will dig deeper, whereas in hard soils, it won't penetrate easily. This means that the type and condition of the soil directly affect how deep the plough can go.
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Ploughing Depth: The depth at which the plough operates is critical. If the depth is too shallow, the efficiency and effectiveness of the ploughing process are reduced.
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Forward Speed of the Tractor: When the tractor moves forward at higher speeds, the ability of the plough to penetrate effectively decreases, affecting the depth control.
Step 2
State THREE items on a tractor that the driver must inspect before starting the tractor.
Answer
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Fuel Level: Ensures that there is enough fuel for the operation of the tractor.
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Water Level: Important for cooling the engine and preventing overheating.
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Tyre Pressure: Correct tyre pressure is critical for safe and efficient operation of the tractor.
Step 3
Describe FIVE advantages of modern combine harvesters over manual harvesting methods.
Answer
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Efficiency: Modern combine harvesters can harvest crops at a much faster rate compared to manual methods, significantly reducing time in the field.
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Reliability: They offer reliable performance with less labor required, ensuring consistent results.
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Labour Saving: Utilizing combine harvesters requires fewer workers, which is beneficial in areas with labor shortages.
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Increased Yield: Harvesters can preserve more crops and reduce losses, ensuring a higher yield.
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Improved Quality: The precision of harvesters helps in obtaining better quality crops with minimal damage.
Step 4
Name FOUR requirements that safety screens on farm machinery must comply with.
Answer
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Safeguard the Equipment: Must protect the machinery from potential hazards.
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Safeguard the Operator: Ensure the safety of individuals operating the machinery.
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Must Appear Neat: Aesthetic considerations are also important for safety screens to not affect the functionality.
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Strong and Durable: The materials used must be resilient to withstand regular use and environmental factors.
Step 5
Step 6
State THREE functions of the slip clutch found in the drive mechanism of a baler.
Answer
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Prevent Heavy Objects from Entering: The slip clutch prevents heavy objects from being drawn into the baler, thus protecting its components.
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Protection for the Pickup: It safeguards the pickup from damage that might occur due to obstruction while operating.
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Overload Protection: The clutch allows for the baler mechanism to disengage when it becomes overloaded, preventing potential mechanical failure.
Step 7
Step 8
State FIVE factors that must be taken into consideration when planning the purchase of a new tractor.
Answer
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Driving Power: Assess the horsepower required for specific tasks.
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Local Availability of Parts and Service: Ensures ease of maintenance and repair.
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Rigidity of Construction: Important for durability and strength under heavy use.
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Versatility: The ability of the tractor to perform multiple functions or tasks.
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Cost/Price of the Tractor: Evaluated against budget constraints and expected return on investment.
Step 9
Redraw the table below in your ANSWER BOOK. Complete the table by comparing V-belts and flat belts under the headings that are given.
Answer
| Headings | V-Belt | Flat Belt |
|---|---|---|
| Ease of installation | Easy to install | Difficult to install |
| Use over long distances | Used over long distances | Can run over long distance |
| Lengthened or shortened | Length cannot be changed | Easily lengthened and shortened |
| Slip under tension | Do not easily slip | Pulleys do slip |
Step 10
Discuss in detail the effect that the presence of air has on the working of a hydraulic system.
Answer
The presence of air in a hydraulic system can lead to several critical issues. Air is compressible, which means it can create inconsistent pressure levels within the system. This can result in the following:
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Pressure Variability: The presence of air causes fluctuations in pressure, leading to an inefficient hydraulic operation.
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Potential for Damage: In severe cases, if air builds up, it can cause pressure bursts, leading to failure of hydraulic components.
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Air Locks: Air can create pockets that can lock the hydraulic fluid flow, effectively causing the system to fail when it is under high demand.
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System Noise: Air bubbles can create noise, indicating poor performance and potential malfunction.
To maintain optimal operation, it’s essential to ensure that hydraulic systems are properly bled to remove any trapped air.