Agricultural Technology Memo 1 (English)

Feb-March 2015 — Grade 12 / Matric — Agricultural Technology

Memo 2015 Grade 12 English

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🎯 200 marks 📄 17 pages 📝 89 items found 📚 3 topics

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Q1— Section header —

1.1.1(2\

1.1.2(2\

1.1.3(2\

1.1.4(2\

1.1.5(2\

1.1.6(2\

1.1.7(2\

1.1.8(2\

1.1.9(2\

1.1.10(2\ (20\

1.2.1Argon (2\

1.2.2Electric arc (2\

1.2.3Reverse (2\

1.2.4Galvanizing (2\

1.2.5Cell phone Satellite p hone (2\ (10\

1.3.1(2\

1.3.2(2\

1.3.3(2\

1.3.4(2\

1.3.5(2\ (10\ TOTAL SECTION A:

Q2— Section header —

2.1TWO reasons why each of the following a lloy metals is used to fabricate the product Milk tanks

2.1.1Resistance to corrosion. Resistance to wear. Resistance to air, water and various chemical acids and alkalis. Resistance to the formation of scale. (Any 2\ (2\ Electrical wire

2.1.2Copper is an excellent conductor of electricity. Copper is an excellent conductor of heat. Copper resist corrosion. Copper is soft and bends easily. (Any 2\ (2\ Pipe fittings

2.1.3Wear resistance. Corrosion resistance The machining ability of brass is good. Brass is the cheapest alloy metal to select. (Any 2\ (2\

2.2The alloy element commonly used with tin to form soft solder Lead. (1\

2.3FIVE conditions under which an adhesive could be used and should be taken into consideration when buying adhesive. Heat resistance/Temperature Water resistance Elasticity Load capacity

2.4FIVE reasons why farmers would prefer fibre glass water drinking troughs for animals Fibre glass is light Fibre glass is w atertight. Can be formed into any shape. Can be sawn, drilled, and filled. ughness.

2.5FIVE advantages of Teflon coated products There is no better sealant than Teflon. Teflon has high dielectric strength. Teflo n coating services will keep other materials covered so that those hazardous chemicals will not harm them.

2.6.1TWO methods that can be implemented to prevent lightning strikes from damaging the energizer Installing lightning protectors. Switch off a ll electricity during thunderstorms. Disconnect when weather is bad.

2.6.2inimum distance that the earth wire/spike of the above energizer must be away from any other electrical system At least 2 meter (1\

2.6.3rt from lightning, THREE natural elements of nature that is extremely harmful to electric fence energizers. Dust Water Fire (3\

2.6.4TWO ways of increasing the earthing efficiency when erecting an electric fence. Increasing the number of earth spikes. Run an earth return wire in parallel to the fence line and connecting it to earth spikes at regular intervals.

2.6.5FIVE requirements warning plates that are attached to electric fences should meet Firmly clamped to t he fence wires at intervals recommended to be of approximately 10 meters to 50 meters, but not exceeding 90

Q3— Section header —

3.1.1How can the energy produced from this device be stor ed efficiently for use during windless days? Batteries (1\

3.1.2THREE disadvantages of wind energy that will influence your choice when choosing an alternative energy source. The main disadvantage regarding wind power is down to the winds unreliability factor. In many areas, the winds strength is too low to support a wind

3.2.1eat energy that is extracted from the earth's inner core. Geothermal energy (1\

3.2.2TWO important issues that can be raised during the initial survey phase before the exploration of the energy source commence. Is the rock soft enough to drill through? Do the rocks deep down contain sufficient heat?

3.3.1THREE advantages of bio fuel The main advantage that bio fuel has over other energy sources is the cost f actor. With the ever increasing prices of crude oil, bio fuel offers a

3.3.2TWO common alternative fuels that are obtained from plant origin. hanol Methanol. (2\

3.4

3.5FOUR disadvantages of solar energy Some areas of the world are not able to benefit from photovoltaic energy. Due to the climate, weather patterns, or high levels of pollution. Sun energy is not available during the night

Q4— Section header —

4.1.1TWO reasons for this problem The torch too close to the metal. The welding pool is too hot. Welding c urrent is too low. (Any 2\ (2\

Q4— Section header —

4.1.4TWO measures that can be applied to solve the prob lem of welding spatter Increase the gas supply to the required reading. Increase the current. Increase the voltage. Clean the surface with an angle grinder.

4.2'Welding galvanized steel is very dangerous'. Give TWO reasons. Galvanized steel contains a zinc coating that produces poisonous carcinogenic gas when it is burnt. Exposure to this substance results in heavy metal poisoning. (Poisonous

4.3orrect process of overhead arc lding Use an arc as short as possible. Weld a number of runs without any lateral movement. When molten metal starts dripping, the amperage should be reduced slightly. Move electrode slightly faster.

4.4THREE hazards to take into consideration when working with the plasma cutter Fire hazard. Vision hazard. Breathing hazard. Electrical hazard. (Any 3\ (3\

4.5Freehand top view sketch of your design to protect the ball valve mechanism Marks will be allocated for the following:

4.5.3Functionality of the drawing. Indicate the positi on of the 2 types of metal profiles that is going to be used in the manufacturing process of the gri and 600 (any applicable length\ Butt and T joints

4.5.4Cutting list 2 le ngths angle iron of 500 x 25 x 6 mm. 2 lengths angle iron of 600 x 25 x 6 mm. lengths flat bar of 500 x 25 x 6 mm (correlate with sketch\. (3\

4.5.5Method that can be used to prevent the metal gri from rusting. Paint ing with a rust res istant paint (1\

4.6.1TWO types of metals that can be cut by using an oxyacetylene cutting torch Mild steel Cast iron Stainless steel (Any 2\ (2\ 10

Q5— Section header —

5.1.1Main aim of the standardi ation of farm implements To help the farmer to work quicker, cheaper and more effectively. (1\

5.1.2THREE advantages of farm implement standardisation Any implement can be used on an y tractor. The same engine and spares can be used on a variety of tractors. Spares can be purchased from any agent instead of a specific

5.2.1ame the c omponent that allows the drive shaft to be used at different operating angles Universal joint. (1\

5.2.2Purpose of a bearing Reducing friction in bearings is often important for efficiency. To reduce wear. To facilitate extended use at high speeds. To avoid overheating and premature failure of the bearing.

5.3.1TWO functions of a differential Changing direction of rotation. Speed reduction. Dividing rotation equal between the rear wheels. (Any 2\ (2\

5.3.2Function of a differential lock A locked diffe rential forces both left and right rear wheels on the same axle to rotate at the same speed under all circumstances. (1\ 12

5.3.3Main function of the final drive. Further reduction in speed. More torque. (Any 1\ (1\

5.4THREE properties of a good clutch It should engage smoothly and not jam, slip or shudder. It should be capable of transferring the maximum load of the engine without slip. When the clutch is disengaged, it should do so completely and not tend to

5.5.1Calculate the diameter of the driven pulley Na Da = Ng Dg 000 200 = 4 000

5.5.2Direction in which the driven pulley rotates Clockwise (1\

5.5.3THREE safety precautions to consider when attaching the hammer mill to the PTO sh aft of the tractor Check if the anchor bolts of the static machine are tight. Check that the universal joints are well lubricated.

5.6.1THREE advantages of making use of V belts instead of flat belts belts do not easily slip off pulleys. belts draw tighter around the pulleys when tension increases. Lubrication is never necessary. belts are relatively strong, and under normal circumstances do

5.6.2THREE requirements f or the screens used for safeguarding implements Must appear neat. Safeguard the equipment. Removed and replaced easily. Do not become loose. Weight saving. Keep out all undesired matter.

5.7.1Identify component A. A is the op link. (1\

5.7.2Identify component B and explain its function B is a s ensitivity element /automatic depth control mechanism Its function is to excite the hydraulic system at a given moment. (2\

5.8.1Which ONE of t he safety device (A or B\ will allow the tractor driver to proceed immediately with a task, after the obstruction has been removed? (1\

5.8. 2 THREE functions of the slip clutch as found in the drive mechanism of a baling machine Prevent heavy objects from being taken into the baler. Protect the pick up if it is impeded by anything. Protect the auger if it becomes overloaded.

5.9rocedure when a rot vator is prepared for use All grease points must be well greased. The correct tension must be set for all belts or chains. Check that all parts are functioning correctly by operating it slowly.

Q6— Section header —

6.1asic pro cedures when selecting a pump Decide on the type of pump that best fits your needs, rotary, centrifugal, submersible, turbine, jet pump, etc. Estimate your flow (GPM\ and pressure requirements.

6.2Reason for dividing a garden irrigation system into different zones There is us ually not enough pressure and available water flow to operate all the sprinklers at once. (1\

6.3Name the spray nozzle Variable flow irrigation sprinkler head. (1\

6.4unction of an irrigation valve It regulates the one directional flo w of water in an irrigation system (1\

6.5THREE factors to consider when purchasing an irrigation sprinkler system. Size of area to be irrigated. The shape of the land. bstructions, such as trees or rocks, may require extra work to water around.

6.6Explain t he working of an irrigation sprinkler. The water passes through the sprinkler head and changes the water flow from a steady stream to a circular arc shape. The water dispersion is designed to maxi

6.7TWO criteria that will influence the farmer s decision on w hen to irrigate a crop. Intuition. Calendar days since the last rainfall or irrigation. Crop evapotranspiration. Soil water. (Any 2\

6.8The working of this fire suppressi sprinkler system Built into the sprinkler head is a heat sensitive bulb or a two part metal link that is held together with an alloy. The bulb or metal lies across the top of the head and acts as a plug to keep

6.9.1Functions of the TWO compartments Anaerobic bacteria in the first tank break down sewage. Very little solids remain when the watery se werage flows to the second tank. Sludge from the first tank must be pumped out periodically.

6.9.2THREE criteria that must be followed when maintaining a septic tank Septic tank sludge must be pumped out periodically. The frequency of pumping out will depend primarily on the amount of wastewater that goes through the system each day.

6.10THREE places where a septic tank may NOT be built Do not build near boreholes, drinking water installations. A suitable distance away from the house. Not near traffic. Not near places where people eat, wash or work regularly.

6.11.1Explain the abbrevia tion GPS GPS stands for the Global Positioning System (1\

6.11.2How can a farmer use a GPS device? Device that pinpoint a precise location on the earth. Harvester (1\ [30] TOTAL SECTION B GRAND TOTAL30

Topics Identified

Plant ProductionAgricultural ManagementSoil Science

Mark Allocation

Total200 marks

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

Paper information

SubjectAgricultural Technology

Year2015

SessionFeb-March

TypeMemo

PaperPaper 1

LanguageEnglish

Pages17

Downloads5

Examination context

Decade2010s

Years ago11y

Season—

Start day—

Exam period—

Days since exam—

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