Agricultural Technology Memo 1 (English)

Exemplars 2014 — Grade 12 / Matric — Agricultural Technology

Memo 2014 Grade 12 English

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🎯 200 marks 📄 17 pages 📝 87 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\

1.2.1Irrigation valve/ Non return valve One way valve (2\

1.2.2Galvanized steel / Zinc (2\

1.2.3Single phase (2\

1.2.4Sunflower (plant oils\ (2\

1.2.5Dry powder (Powder\ (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 —

2.1.1THREE main alloy elements found in stainless steel Chromium Manganese Nickel (3\

2.1.2TWO influences of EACH of the three alloy elements Chromium Increases resistance against corrosion Promotes the hard ening of steel Improves strength

2.2Preca utionary measure to take to prevent cracks and brittleness Preheating of the whole part / area that must be soldered. (2\

2.3THREE applications of bronze products Bearings Electrical connectors prings Taps Pipe connecters Hamme

2.4TWO properties of copper Copper is an excellent conductor of electricity Copper is an excellent conductor of heat. Ductile and easily joined by soldering. It resists corrosion (Any 2\

2.5.1Adhesive to stick the posters to the wall. Presti (1\

2.5.2Difference between cohesion and adhesion. Cohesion Inherent strength of the adhesive. Adhesi Ability of the molecules of an adhesive to cling to the molecules of other substances. (4\

2.6THREE precautionary measures to be followed when 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.

2.7.1FIVE safety regulations applicable to electric fences. ust cause no electrical hazards to persons, animals or their surroundings. onstructions, which are likely to lead to entanglement of animals or persons, must be avoided.

2.7.2Ways of increasing the earthing efficiency of an electric fence. Increasing the number of earth spikes. Run an earth return wi re in parallel to the fence line and connecting it to earth spikes at regular intervals.

2.7.3The main purpose of the conductor wire of an electric fence. To carry the electric fence charge throughout the length of the fence. (2\

2.7.4ONE type of wire that is not allowed to be electrified. Barbed wire or razor wire. (Any 1\ (1\ [35]35

Q3— Section header —

3.1Type of solar system that can be us ed to heat water in a dairy, alternatively to Photo voltaic panels. Solar hot water panels (1\

3.2.1THREE factors that can influence the efficiency of the solar cells. he cell is not working to its full potential he electrons rel ease heat; the panel also becomes warm, interfering with other aspects of the solar cells.

3.2.2Is it possible to store the energy? Yes

3.2.3Motivat ion for

3.2.2( The answer should be YES in 3.2.2\ The electric energy produced during daytime can be used to charge a battery that can be used during night time (1\

3.2.4The device that can be used to change the direct current to alternating current. Inverter/transformer /converter (1\

3.3Descri ption of how this structure generates electrical energy. Wind turns a turbine / generator blades, which are shaped to harness

3.4Methanol can be obtained from different products. Name TWO. Methane gas landfills. Fermented waste products such as sewage and manure. (2\

3.5.1TWO advantages of geothermal energy. geothermal system does not create any pollution. The cost of the land to build a geothermal power plant on is usually less expensive. (affordable\ eothermal plants take up very little room, so you

3.5.2ONE instance where the use of geothermal energy can cause pollution. Harmful gas es that escape from deep within the earth. (1\

3.5.3Consequences if you pump too much cold water into the Geothermal heat source. t will result in the rocks cooling down too much resulting in the

3.6TWO disadvantages of wind as an alternative energy source. ind is unreliable . In many areas, the winds strength is too low to support a wind turbine or wind farm, and this is where the use of solar could be a great

Q4— Section header —

4.1.1THREE limitations of the MIG welding machine. Higher initial setup cost. Atmosphere su rrounding the welding process has to be stable hence the shielding gasses\, therefore this process is limited to draught

4.1.2FOUR reasons that make porosity occur in welding joints. Gas flow too low or too high. (wrong welding technique\ Blocked nozzle. Leaking gas lines. Draughty conditions. Nozzle distance from work too far.

4.1.3Name and draw THREE other welding run figures. (6\ 10

4.2.1he farmer preference for plasma cutting machine instead of an oxy acetylene cutting torch. Economical Plasma cutting is more economical than oxy fuel for thickness under 25

4.2.2TWO gasses for plasma cutting, and ONE application for each. Compressed Air: Mild st eel, aluminium or stainless steel. Oxygen:

4.3FOUR categori es of personal protection. Work clothing (Overall\ Eye protection (Safety glasses, welding helmet, welding goggles, safety visor\ Ear protection (Muffs, plugs\

4.4reehand sketch of the gate with two hinges and a lock mechanism Tolerance accepted, (1 or 2 marks\ Proportional drawing Practical applicability Show TWO hinges Show ONE lock mechanism Show

4.5arts labelled as A and B. A Cutting nozzle. B Cutting Oxygen lever. [35] 1235

Q5— Section header —

5.1.1Name the device. Grease nipple. (1\

5.1.2The main function of this device. A grease fitting or grease nipple is a metal fitting used in mechanical syste ms to feed lubricants, usually lubricating grease, into a bearing under moderate to high pressure using a grease gun.

5.2ears labelled A, B and C Straight cut gear or spur gear. Helical gear. Double helical gear or herringbone ge ar. (3\

5.3Calculate the amount of teeth on the driven gear Gear ratio rive gear riven gear 1 : 3 = OR 3 X 60

5.4afety mechanism that is built into the system of farm implements Shear bolt or shear p in. Ram stop safety mechanism. Ratchet plate Slip clutch Pressure relief valve Kill switch

5.5.1Main reason for side overturns. Side overturn s result from the change in the tractor s centre of gravity due to the additional weight of the bale. (1\

5.5.2THREE precautionary measures to safeguard a worker from being crushed while lifting bales. Make sure that the tractor is fitted wi th a cage or cabin. Do not lift the bale to high. The tractor must stand level so that the bale cannot dislodge.

5.6.1orrect met hod for coupling a trailer. (1\

5.6.2Motivat ion. Assure the tractor drawbar is in the lowest, most centred and stationary position. This will prevent the tractor s front wheels from lifting and keep the wheels moving in a straight line an

5.6.3Why a low gear be selected for a tractor The low gears in the gearbox help to brake the tractor to support the brakes if they are not sufficient when pulling a heavy load. (1\

5.6.4hy bales should not touch the tyres. The friction of the hay against the rotating tyre can generate enough heat to ignite the hay at higher speeds. (1\

5.6.5THREE safety precautions. Keep people out of the area between the trailer and tractor dur ing hitching. Hand signals should be used and understood by both the operator and those assisting. Hitch the trailer only to the drawbar; never attach to any other point

5.7.1Working of the double action hydraulic cylinder. When the control lever is in neutral position, the oil is pumped to the control valve and back t o the oil container via the oil filter. The moment the control lever is shifted to the lift position, the control

5.7.2THREE advantages of transmission oil. Not compressible. Good lubrication qua lities. Remains liquid over a large temperature range. Not volatile. Relatively cheap. Easily conductible in pipes. Flows through filters, pipes, oil pumps and cylinders with ease.

5.7.3Strongest side of the double action hydraulic cylinder The side without the shaft. (1\

5.7.4Motivat ion. The side without the shaft is stronger than the side with the shaft because the area that is subjected to the oil pressure in the cylinder is larger than the part of the cylinder, which contains the shaft.

5.8.1THREE main components of the clutch. Clutch plate Pressure plate Release bearing (3\

5.8.2THREE reasons for equipping a tractor with a clutch. Engine drive needs to be disengaged when gears are changed. Drive should be disengaged when the tractor is started. The clutch is disengaged to allow engine speed to increase and

5.9The parts that should receive special attention when examining the tractor. Engine Gear Final drive Cooling system Fuel system Steering mechanism Instruments

Q6— Section header —

6.1.1Reason for the centre pivot irrigation system considered as a labour saving system. No labourers needed to shift the pipes/system.

6.1.2esign principles of effective watering in a centre pivot irrigation system. The size of the nozzles vari s from small nearer to the centre an larger to the outside. Distance between adjacent sprinkl ers

6.2THREE reasons for the use of irrigation software. To save water. It is used as part of water scheduling. Time saving. Labour friendly. For a big system, software may be the only way to c

6.3.1Why is it necessary to install such a system in the farmhouse Due to pollution and other contaminants in drinking water supplies, it has become necessary to clean all usable water from harmful microbes, bacteria and chemicals.

6.3.2THREE other effective processes that can be used to purify drinking water Distil process. Reverse osmos Whole house water p urification systems. Faucet water filters. Jug or pitcher that filters water.

6.4Problems associated with irrigation of agricultural land Competition for surface water rights. Depletion of underground aquifers. Ground subsidence. Under irrigation or irrigation giving only just enough water for the plant (e.g.

6.5FOUR different types of home drainage systems. French drain Channel drain Downspouts Slope drain Drainage ditch (Any

6.6THREE substances that must never be flushed down a toilet. degradable m aterials lastic igarette butts, rags, etc. isinfectants leaches, oils or fats (Any 3\

6.7.1THREE advantages Variable Rate Technology ( VRT\ Cost s aving Time saving Saving on time using implements and tractors Labour saving

6.7.2TWO other systems that are used for precision farming other than VRT. GIS Geographic Information System GPS Global Positioning System Google earth Computer systems (any 2\

Topics Identified

Plant ProductionAgricultural ManagementSoil Science

Mark Allocation

Total200 marks

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

Paper information

SubjectAgricultural Technology

Year2014

SessionExemplars

TypeMemo

PaperPaper 1

LanguageEnglish

Pages17

Downloads7

Examination context

Decade2010s

Years ago12y

Season—

Start day—

Exam period—

Days since exam—

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