Identify the safety mechanism indicated by arrow A in the drawings below - NSC Agricultural Technology - Question 5 - 2016 - Paper 1
Question 5
Identify the safety mechanism indicated by arrow A in the drawings below.
5.2 The picture below shows an implement which... show full transcript
Worked Solution & Example Answer: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 to prevent damage to the machine.
Step 2
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 that prevents the implement from swinging sideways is known as stabilising chains.
Step 3
Which mechanism must be adjusted to set the horizontal levelness of the implement?
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The mechanism that must be adjusted to set the horizontal levelness of the implement is the top link.
Step 4
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 on the tractor where the cross angle of the implement can be adjusted is called the levelling box.
Step 5
State THREE maintenance procedures that must be followed when the hay rake is stored for a long period.
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Lubricate and grease all moving components to prevent rust.
Check all bearings and repair any that are broken.
Store the rake in a dry place under cover to protect it from the elements.
Step 6
Name TWO types of baling machines and identify the type of bales that EACH machine produces.
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Ram or piston type - makes rectangular bales.
Roller type - makes cylindrical bales.
Step 7
Name components A, B, and C in the sketch above.
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A. Removable warning lights/Brake light.
B. Safety emblem/triangle.
C. Reflectors/indicators/reverse lights.
Step 8
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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After daylight hours (at night).
In poor visibility (rainy or windy).
During periods of high vehicle traffic (peak hours).
Step 9
Identify THREE mechanical problems that can occur during the use of a combine harvester.
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Loss of kernel from improper settings.
Thresher set too fast, which breaks the kernels.
Engine overheating due to cooling system failures.
Step 10
State THREE major causes of metal fatigue on a hammer mill.
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Vibration or excessive speeds leading to wear and tear.
Unbalanced hammers or rotors.
Rust or corrosion affecting metal integrity.
Step 11
Name the component on a tractor that activates the control valve of the hydraulic system.
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The component that activates the hydraulic control valve of a power lift system is the operator's control lever.
Step 12
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. Show ALL calculations.
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Using the formula: Na × Da = Ng × Dg,
where:
Na = 25 rpm (drive pulley),
Ng = 100 rpm (driven pulley),
Dg = 100 mm (diameter of driven pulley),
we get:
25 × Da = 100 × 100,
25 × Da = 10000,
Da = 10000 / 25 = 400 mm.
So, the diameter of the drive pulley is 400 mm.
Step 13
Determine the turning direction of the driven pulley if the V-belt is crossed as indicated in the drawing above.
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If the V-belt is crossed, the turning direction of the driven pulley would be anti-clockwise.
Step 14
State THREE disadvantages of using V-belts in drive systems.
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V-belts are more difficult to install than flat belts.
V-belts cannot be joined, which can limit length options.
When overloaded, V-belts can be more dangerous than flat belts.
Step 15
Name THREE factors to consider before purchasing a new tractor.
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Driving power (kW).
Local availability of parts and service.
Rigidity of construction.
Step 16
State TWO advantages of mechanisation for agriculture.
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Increased profits and productivity.
More effective production with reduced work load on labourers.
Step 17
Indicate whether EACH tool (A, B, C, and D) is either pneumatic or hydraulic.
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A. Pneumatic.
B. Hydraulic.
C. Pneumatic.
D. Hydraulic.
