Agricultural Technology Memo 1 (English)

Feb-March 2014 — Grade 12 / Matric — Agricultural Technology

Memo 2014 Grade 12 English

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🎯 200 marks 📄 11 pages 📝 54 items found 📚 3 topics

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Q1— Section header —

1.17.18

Q2— Section header —

2.1.1Nail plate. Hold the beams of the truss together. (2\

2.1.2Pine. (1\

1.3Triangles because of their specific shape/design are very strong. It strengthens the construction so that the struts can carry the weight of the roof. (3\

2.1.4Paint with a liquid and insect repellent /retardant preservative. (Creosote\ (2\

2.2.1Within 3 months cement will lose 20% of its strength and 40% after 6 months. (2\

2.2.2Cement must always be stored in a dry place free of moist. Plastic can be used to cover the cement packs so that the cement is protected agains t moisture. Cement bags must be stored on wooden planks to

2.2.3Building sand consists of particles between 0, 1 mm and 5 mm in size. Sand must be free from dust, clay, silt or org anic material such as leaves and grass etc. Sand derived from shale or slates must be avoided.

2.2.4Shale/ slates/lime/ san dstone must be avoided. (1\

2.3.1Stretcher bond. (1\

2.3.2Put damp proof course (DPC\ waterproofing between the foundation and the first brick layer. (2\

2.3.3Galvanised steel wire or brick force can be laid on every third layer o bricks. (2\

2.4.1The adhesive itself should not distort, melt or burn when heated. (1\

2.4.2When placed in humid conditions, a water resistant adhesive should be used to make a joint. (1\

2.4.3If we want to join elastic materi als, we would use an adhesive, which would still be elastic after it has dried out. (1\

2.4.4The adhesive should be able to withstand mass, weight, load or tension. (1\

2.4.5Adhesive should be resistant to open flames. (1\

2.5Catalyst and accelerator should always be stored separately.(Explosion\ Remove all resin catalyst and accelerator from skin. Wear gloves if skin is sensitive. Use acetone in well ventilated room. Handle resin casting carefully, they are brittle.

Q3— Section header —

3.1.1Photo voltaic cell. (1\

3.1

3.1.3Inverter / transformer. (1\

3.2.1Wind turbine. (1\

3.2.2It converts the kinetic energy present in wind into mechanical energy an d then into electrical energy. The blades are shaped like an aeroplane wing to make the most of the prevailing wind. The turning motion is then transferred to the turbine rotor

3.2.3Unreliable wind factor. Normally produces a lot less electricity than the average fossil fuelled power station. Multiple wind turbines must be erected to make an impact. The construction of these wind turbines can be very expensive

3.3Low cost because it is made of plant and animal waste. Biodegradable and do not harm the environment when combusted. A lot less polluting environment friendly. Conventional fuels takes years to regenerate not so for bio fuels.

Q4— Section header —

4.1.1MIG or CO welding. (1\

4.1.2Preventing the welding bead to come into contact with oxygen during welding. (1\

4.1.3The wire melts to form the joint between the two metals one want to join.

4.1.4The filler wires gets too short. Use anti spatter or spatter release spray. (2\

4.1.5High alloy steel. (stainless alloys\ Aluminium. Mild steel. (3\

4.2.1Inverter uses a much smaller transformer than traditional arc welders. More compact, p ortable, lightweight. Consume less power /use less current. Cheaper to manufacture. An inverter welder produces a smo

4.2.2rectifier converts the incoming AC (alternating current\ into DC (direct current\ This current is then switched on and off very quickly, creating a pulsed high frequency direct current. The high frequency, low

4.2.3Welding helmet. Welding gloves (leather\ Welding apro n (leather\ Welding spats. Welding overall. Welding boots. (3\

4.2.4(1\

4.3.1Longitudinal shrinking. Angular shrinking longitudinally. Angular shrinking. Lateral shrinking. (4\

4.3.2Duration of welding being done. Number of welding runs. Degree of resistance. Original state or condition of material that must be welded. Welding procedure. (5\

4.4Tack the prepared work pieces together. Lean the electrode in the direction of travel and p oint it slightly upwards. Strike an arc and run a bead along the joint. Shorten the arc length and increase the upward angle of the electrode if

5.1.1BELTS FLAT BELTS Draw tighter around pulleys when tension increases. Easily installed or taken off. Are relatively strong, and under normal circumstances do not break easily. Used over a long

5.1.2Formula: Na X Da = Ng X Dg Na = Ng x Dg Na = 4000 x 150 Na = 2000 in

5.2.1Check if the anchor bolts of the static machine are tight. Check that the universal joints are well lubricated. Check that the driving shaft guard is present and without cracks. Ensure that the driving sh

5.2.2Do not work on the machine while it is still in motion. Ensure that there are no loose objects lying inside the machine when starting it. Wear safety goggles. Do not use the machin e when the rotor is out of balance.

5.2.3Regular lubrication. Hammers should be replaced with the correct type. Hammer mill must be correctly anchored. PTO coupling done correctly. Clean after each job. Sieves and screens inspected on a regular base. (Any 4\

5.3.1

5.3.2Straight cut gear (Spur gear\ Helical gear. Double helical gear (Herringbone gear\ (3\ [40] 1040

Q6— Section header —

6.1.1Marks will be allocated for: Correctness. Labelling. Neatness. Manhole covers Inlet Liquid level Outlet

6.1.2The incoming effluent will be diverted downward with a minimum of splashing, allowing the solids to sink to t he bottom. When the water level rises high enough it flows over the dividing wall into the second compartment.

6.1.3Near boreholes. Drinking wate r installations. Near the house. A suitable distance away from the house. Near traffic. Where people eat, wash or work regularly. (Any 4\ (4\

6.2

6.3For correct calibrating of the sprayers. Effective scheduling of irrigation. To prevent the over utilisation of the water source. [30] TOTAL SECTION B: GRAND TOTAL:30

Topics Identified

Plant ProductionAgricultural ManagementSoil Science

Mark Allocation

Total200 marks

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

Paper information

SubjectAgricultural Technology

Year2014

SessionFeb-March

TypeMemo

PaperPaper 1

LanguageEnglish

Pages11

Downloads5

Examination context

Decade2010s

Years ago12y

Season—

Start day—

Exam period—

Days since exam—

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