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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 can penetrate deeper, whereas in hard soil, it faces more resistance. This means that the soil type greatly influences the effective depth of ploughing.
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Forward Speed of the Tractor: If the tractor operates at a high speed, the plough may not penetrate effectively and could lead to uneven depth control.
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Ploughing Depth: The depth at which the plough is set can impact how well it works. Deeper ploughing may require adjustments to the tractor's settings to maintain effectiveness.
Step 2
State THREE items on a tractor that the driver must inspect before starting the tractor.
Answer
- Fuel Level: Ensuring that there is enough fuel is essential for operation.
- Water Level: Check the coolant levels to prevent overheating.
- Tyre Pressure: Proper tyre inflation is critical for safety and performance.
Step 3
Describe FIVE advantages of modern combine harvesters over manual harvesting methods.
Answer
- Efficiency: Combine harvesters can harvest crops much quicker than manual methods, saving time.
- Reliability: They offer a consistent method of harvesting, which reduces crop loss and ensures better yield.
- Labour Savings: With machinery, fewer operators are needed, which reduces labor costs.
- Better Crop Management: They aid in monitoring crop phases and conditions more effectively.
- Single Operation: Combines can perform multiple tasks in a single pass, increasing productivity.
Step 4
Name FOUR requirements that safety screens on farm machinery must comply with.
Answer
- Safeguard the Equipment: Screens must protect machinery from potential hazards.
- Safeguard the Operator: Protect operators from moving parts or debris.
- Must Appear Neat: Screens should not hinder visibility or accessibility to important controls.
- Strong and Durable: Be made from materials that can withstand rigors of farm environments.
Step 5
Step 6
State THREE functions of the slip clutch found in the drive mechanism of a baler.
Answer
- Prevents Overloading: Protects the baler from damage by disengaging if too much resistance is encountered.
- Allows Smooth Operation: Facilitates movement of parts without sudden stops, leading to consistent performance.
- Protects the Auger: Ensures that the auger is not damaged if it becomes overloaded.
Step 7
Step 8
State FIVE factors that must be taken into consideration when planning the purchase of a new tractor.
Answer
- Driving Power: Assessing the horsepower needed for your operations.
- Local Availability of Parts and Service: Ensuring that support is easy to access.
- Rigidity of Construction: Evaluating the build quality for durability.
- Simplicity of Control Mechanisms: Easy-to-use controls improve efficiency and safety.
- Cost/Price of the Tractor: Ensuring the investment fits within budget constraints.
Step 9
Complete the table by comparing V-belts and flat belts under the headings that are given.
Answer
Comparison Table
| 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 | Does 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
In hydraulic systems, the presence of air is detrimental. Air is compressible, which can lead to higher pressure in the hydraulic system. This can cause issues such as:
- Bursting of Hoses: Increased pressure may exceed the hose's working limits, leading to bursts.
- Inefficiency: The compressible nature of air means that not all energy input is used effectively — leading to a loss in performance.
- System Shudder: Air in the system can cause irregular operation and vibrations, compromising the efficiency and stability of the system. It is crucial to ensure that hydraulic systems are free of air to maintain optimal performance.