Agricultural Technology Memo 1 (English)

May-June 2024 — Grade 12 / Matric — Agricultural Technology

Memo 2024 Grade 12 English

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1.1.10(20\

1.2.1Tin.

1.2.2water.

1.2.3flame.

1.2.4Teflon.

1.2.5Nickel (10\

1.3.5(10\ TOTAL SECTION A: 40 Agricultural T ch nolog

Q2— Section header —

2.1.1Why chromium is a suitable alloy for the manufac turing of milk tanks. Increases resistance against corrosion. Promotes the hardening of steel. Improves strength. Improves resistance to the formation of scale.

2.1.2An alloy element, other than chromium, that can be added to stainless steel to ensure resistance to air, water and many acids and alkali. Nickel. (1\

2.2.1A reason why copper is not a suitable material for the manufacturing of pipefittings Copper is too soft Copper is likely to bend (1\

2.2.2The name of the alloy element that is used with copper to form durable brass pipefittings Zinc. (1\

2.2.3THREE properties of brass. Streng th Ductility Wear resistance Hardness Conductivity Corrosion resistance Antimicrobial

2.3THREE common uses of in. Tin is used as a coating on the surface of other metals to prevent corrosion. Alloys of tin: Soft solder, pewter, bronze and phosphor bronze. Tin chloride is used as a penetrant in dyeing textiles and for increasing

2.4.1TWO important aspects that must be considered when choosing a specific adhesive for a repairing task. Type of materia l to be joined. Conditions under which this joint will be used. (2\

2.4.2Discussion of heat resistance as a property of an adhesive. The adhesive itself should not distort , melt or burn when heated. (Any 2\ (2\

2.4.3Explanation of the difference between duration of usability and duration of cohesion in adhesives. Duration of usability: Period of time during which the mixed adhesive remains usable before setting.

2.5.1FOUR characteristics of fibre glass which makes it a suitable material for the manufacturing of small boats. Lightness. Watertight Can be casted into any shape. Easy to colour.

2.5.2FOUR precautionary measures that must be taken by the person working with fibreglass Catalyst and accelerator should always be stored separately. Remove all resin catalyst and accelerator from skin. Wear gloves if skin is sensitive.

2.6A few types of material used on farms.

2.6.3Vesconite Magazines for guns , Teflon tape , Teflon coated cooking pans , Teflon tape for sealing fittings , Car wash products

2.7.1Name of part A. Earth spike. (1\

2.7.2Identification of the device shown in the illustration that produces the electricity for the electric f ence. Energiser (1\

2.7.3Function of part B. Insulators are used to fasten electrified wire to fence posts without losing energy through the posts. (1\

2.7.4The material from which part B is manufactured. Ceramic, Plastic, PVC (Any 1\ (1\ [35] Agricultural T35

Q3— Section header —

3.1.1TWO instances where a small wind turbine can be useful on a farm. Electrical water pump Small home/caravan/ boat Auxiliary power for security gate/CCTV/Lights To charge batt

3.1.2TWO disadvantages of wind turbines. Insufficient wind in the area Effectiveness of wind turbines Noise pollution. Competition with other alternative energy source s. High

3.1.3The importance of a large wing area in relation to the generation of electrical energy. The larger the wing area of the blades the more wind energy is harnessed to rotate the turbine (2\

3.1.4The device installed in the head of the wind turbine to decrease torque and increase input shaft speed to the generator. Gearbox. (1\

3.2.1Identification of the type of alternative energy system. Photovoltaic Solar energy (1\

3.2.2A suitable material for the coating on the panels and ONE property of this coating. Material: Shatterproof glass/Teflon/Silicon Ceramic Property: Self cleaning/ Lightwei

3.2.3A component that can be installed in the system to prevent overcharging of the batteries. Regulator/Charge controller. (1\ Agricultural T ch nolog

3.3Correct sequence of the geothermal power station. STEPS GENERATION SEQUENCE Cold water is pumped into the borehole

3.4Descrip and one example of such a fuel Biofuel or bioorganic fuel is any plant or animal matter that can be combusted and used as a fuel.

Q4— Section header —

4.1.1Identification the part on the MIG welding aparatus th at are used by the welding operator to activate the el ectrical charge to the workpiece Trigger /switch on the MIG welding gun.

4.1.2Descri tion of the MIG welding process The MIG welding machine sends a current through the continuous ly fed positive wire to the welding area when the operator presses the trigger on the welding torch

4.1.3The composition of the MIG welding shielding gas. Argon, Helium, CO (3\

4.1.4FOUR problems that will prevent the welding wire not to feed through the torch gun when welding. Blocked/defective contact tip. Loose/broken wire drive/ro llers. Entangled wire in delivery pipe. Broken torch trigger switch.

4.1.5Identification of the welding de fect. Defect ndercutting. Causes Speed too fast,

4.2Descri tion of the procedure that must be followed in preparing galvanized metal for the welding process. This galvanized coatin g makes it difficult to be welded and must be removed prior to welding

4.3Labelled drawing of a horizontal square butt weld. Marks will be allocated for the f ollowing: Design Angle of electrode Direction of travel

4.4THREE pipe welding positions Horizontal fixed position Horizontal movable position Vertical position (3\

4.5.1Metals that should not be cut with the apparatus with a motivation. Aluminium, opper Their high thermal conductivity causes them to melt away too quick, leaving a very porous cut

4.5.2When the torch is moved too fast when cutting a thick metal plate. The molten puddle will stick to one another The flame will not penetrate the plate The cut will form slag (3\

4.6.1The material that is used for manufacturing the plasma cutter combustion cap. Porcelain Ceramic (Any 1\ (1\

4.6.2THREE properti es of the Porcelain/Ceramic. Heat resistant Durable Does not conduct electricity (3\

Q5— Section header —

5.1.1Identification of the power source of each of the mowers. Electric. Petrol. (2\

5.1.2TWO maintenance tasks to be performed on mower B. Safety screens/equipment should be inspected and in place. Check oil and fuel level. Replace broken/worn parts. Service according to manufactures specificatio

5.1.3TWO safety tips when working with lawn mowers. become familiar with the machine. Remove all debris from lawns before mowing. Use recommended PPE including close fitting clothing

5.2.1Identification of the safety hazards No safety screen in place. Damaged safety screen. Worker climbing over PTO

5.2.2When setting up a hammer mill, it needs to be on a level surface. Motivation for the statement. Yes Ensures the mass of moving parts are spread equally over bearings. Cyclone hang level on the blower pipe.

5.2.3

5.3Matc hing of the correct use of parts

5.3.5D. E. B. C. A. (5\ Agricultural T ch

5.4.1abl with TWO advantages and TWO disadvantages of each type of baler. BALE TYPE: ADVANTAGES:

5.4.2TWO methods that can be used to load large bales onto a trailer. Front end bale loader /Fork loader Mechanical devices/Conveyer belt. Loader on the three point mechanism. (2\

5.4.3TWO safety measures need to be followed when bales are transported to the shed. Only one person on the tractor. No one allo wed to sit on bales during transport. Do not over speed. Use a lower gear when going downhill, since the tractor brakes

5.5.1The part that enables the lifting arms to start moving. Control lever. (1\

5.5.2Name of the part labelled as A Automatic depth control mechanism/ sensitivity element spring. (1\

5.5.3Explanation of what will happen to the plough if the top link is not connected and the tractor starts moving forward. The back of the plough will tend to lift up out of the soil or the front of the tracto

5.6Identification of the type of hydraulic cylinder used in the pictures.

5.6.3Single action hydraulic cylinder Double action hydraulic cylinder Single action hydraulic cylinder (3\ [40] Agricultural T ch nolog40

Q6— Section header —

6.1.1TWO advantages of using this irrigation system. Time saving. Can irrigate large lands. One man operation. (Any 2\ (2\

6.1.2TWO commu nication devices that a farmer can use to effectively control the system. Cell phone Tablet Computer Laptop (Any 2\ (2\

6.1.3TWO tips a farmer must consider before choosing the type of fertiliser to apply through a centre p ivot irrigation system. Fertiliser with a high acid content must be avoided. Fertiliser with large particles must be avoided.

6.2.1When a farmer would prefer pump A over pump B. No electrical power required to operate the pum p. Can pump larger volumes of water. It can be moved easily/mobile. No electrical installation needed. No shocking hazards.

6.2.2THREE factors to consider when choosing a new pump for an irrigation field. Type of pump. Estimated flow ( Pressure requirements. Research available for pump models.

6.2.3THREE reasons why PVC pipes are preferred over steel pipes to supply water to an irrigation system. PVC does not rust. PVC is lightweight. PVC is flexible. Easy to join. Available in long lengths. Easy to work with.

6.2.4Calculation of the time it will take to empty the water source Formula: Flow rate = Volume of water Time Time =

6.3TWO types of drainage system that can be used to remove excess water around the buildings of a da ry farm. Channel d rain. Slope drain. Drainage ditch. (Any 2\

6.4TWO different water purification methods that can be used to purify brackish water. Distillation. Reverse osmosis. (Any 2\ (2\

6.5.1Explanation of the construction and working of the distribution field that is connected to the septic tank. A system that consist of a narrow trench, partially filled with a bed of washed gravel or crushed stone, into which perforated

6.5.2Why a distribution field should NOT be built near drinking water installations or boreholes. Septic tank water is contaminated with harmful chemicals. It will contaminate the water wi th deadly pathogens/bacteria

6.6TWO instances where V.R.T (Variable Rate Technology\can be used in precision farming. Precision planting. Application of Fertilizers/Lime. Water application Irrigation systems. Application of Pesticides/H

Topics Identified

Plant ProductionAgricultural ManagementSoil Science

Mark Allocation

Total160 marks

Sections35 + 20 + 35 + 40 + 30 = 160 marks

Paper information

SubjectAgricultural Technology

Year2024

SessionMay-June

TypeMemo

PaperPaper 1

LanguageEnglish

Pages17

Downloads4

Examination context

Decade2020s

Years ago2y

Season—

Start day—

Exam period—

Days since exam—

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