5.1 Identify the safety mechanism indicated by arrow A in the drawings below - NSC Agricultural Technology - Question 5 - 2016 - Paper 1
Question 5
5.1 Identify the safety mechanism indicated by arrow A in the drawings below.
5.2 The picture below shows an implement w... show full transcript
Worked Solution & Example Answer:5.1 Identify the safety mechanism indicated by arrow A in the drawings below - NSC Agricultural Technology - Question 5 - 2016 - Paper 1
Step 1
Identify the safety mechanism indicated by arrow A
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Answer
The safety mechanism indicated by arrow A is a shear bolt or shear pin. This mechanism is designed to break under excessive load, preventing damage to the machine.
Step 2
5.2.1 Name the component that is used on the three-point mechanism of the tractor that will prevent the implement from swinging sideways when it is being used
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Answer
The component used on the three-point mechanism to prevent sideways swinging of the implement is the stabilising chains.
Step 3
5.2.2 Which mechanism must be adjusted to set the horizontal levelness of the implement?
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To set the horizontal levelness of the implement, the top link must be adjusted.
Step 4
5.2.3 Name the component on the tractor where the cross angle of the implement can be adjusted in relation to the tractor
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The component where the cross angle of the implement can be adjusted is the levelling box.
Step 5
5.2.4 State THREE maintenance procedures that must be followed when the hay rake is stored for a long period
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Three maintenance procedures to follow include: 1. Lubricate and grease all moving components to prevent rust. 2. Check all bearings for wear and replace if necessary. 3. Store the rake in a dry place under cover to protect it from the elements.
Step 6
5.3 Name TWO types of baling machines and identify the type of bales that EACH machine produces
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Two types of baling machines are: 1. Ram or piston type, which produces rectangular bales. 2. Roller type, which produces cylindrical bales.
Step 7
5.4.1 Name components A, B and C in the sketch above
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Component A is the removable warning lights or brake lights, Component B is the safety emblem or triangle, and Component C is the reflectors or indicators for reverse lights.
Step 8
5.4.2 State THREE circumstances under which it is advisable NOT to drive on a public road with an abnormally wide load on the trailer
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The advisable circumstances include: 1. After daylight hours (at night), 2. In poor visibility, and 3. In bad weather (rainy or windy conditions).
Step 9
5.5 Identify THREE mechanical problems that can occur during the use of a combine harvester
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Three mechanical problems include: 1. Loss of kernel moisture due to incorrect settings, 2. Thresher set too fast which may break the kernels, and 3. Failure of the auger which can lead to blockages.
Step 10
5.6 State THREE major causes of metal fatigue on a hammer mill
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Three major causes of metal fatigue are: 1. Vibration or excessive speeds that can cause wear, 2. Unbalanced hammers or rotors that lead to uneven loading, and 3. Rust that weakens structural integrity.
Step 11
5.7 Name the component on a tractor that activates the control valve of the hydraulic system
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The component that activates the control valve of the hydraulic system is the operator's control lever.
Step 12
5.8.1 Calculate the diameter of the drive pulley if it turns at 25 revolutions per minute and the driven pulley turns at 100 revolutions per minute
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Using the formula: Na × Da = Ng × Dg, we know that:
Ng = 100 RPM (driven pulley)
Na = 25 RPM (drive pulley)
Dg = 100 mm (diameter of driven pulley)
Then,
25 × Da = 100 × 100
Da = \frac{10000}{25}
Da = 400 mm
Thus, the diameter of the drive pulley is 400 mm.
Step 13
5.8.2 Determine the turning direction of the driven pulley if the V-belt is crossed as indicated in the drawing above
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The turning direction of the driven pulley will be anti-clockwise if the V-belt is crossed.
Step 14
5.8.3 State THREE disadvantages of using V-belts in drive systems
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Three disadvantages of using V-belts include: 1. V-belts are more difficult to install than flat belts, 2. V-belts cannot be joined easily as they need specific lengths, and 3. V-belts are more dangerous than flat belts due to slippage during operation.
Step 15
5.9 Name THREE factors to consider before purchasing a new tractor
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Three factors to consider are: 1. Driving power (kW), 2. Availability of parts and service in the locality, and 3. Rigidity of construction for durability.
Step 16
5.10 State TWO advantages of mechanisation for agriculture
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Two advantages of mechanisation include: 1. Increased profits and productivity, and 2. Reduced work load on labourers.
Step 17
5.11 Indicate whether EACH tool (A, B, C and D) is either pneumatic or hydraulic
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Tool A is pneumatic, Tool B is hydraulic, Tool C is pneumatic, and Tool D is hydraulic.
