Agricultural Technology Memo (English)

November 2019 — Grade 12 / Matric — Agricultural Technology

Memo 2019 Grade 12 English

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🎯 200 marks 📄 15 pages 📝 57 items found 📚 3 topics

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1.1.10(2\ (2\ (2\ (2\ (2\ (2\ (2\ (2\ (2\

1.2.5Penetrable /spong permeable /Cylindrical /Vermeer mers /Rotor /Hydraulic Negati

1.3.5or H A, E or H (2\ (2\ (2\ (2\ (2\ [10]10

2.1.1The metal that can effectively be used for solde ring. Brass /stainless steel/ mild steel (1\

2.1.2The metal that will be the best for installation of warm water pipes in a farm house. (1\

2.1.3The material that is used to manufacture foil that is used to cover food. Alum inium (1\

2.1.4THREE reasons why stainless steel is the best material that can be used to manufacture food processing equipment. It is resistant against corrosion. It is harder than steel/tensile strength. It is resistant against air, water and

2.2THREE factors that you must consider when identifying tin. When heat ed in air, tin forms tin oxide (stannic oxide\ which is feeble acidic. Pure white tin slowly tends to become grey powder. Tin is a silvery

2.3TWO advantages of a tin/copper alloy compared to pure coppe The alloy becomes harder than copper. It is more easily casted than copper. Strength. (2\

2.4TWO properties of bronze. Bronze resists corrosion. (especially seawater corrosion\ Resists metal fatigue more than steel. Better conductor of h eat and electricity than most steels.

2.5TWO important aspects tha t must be considered when an adhesive is to be chosen for a specific application. Type of material to be joined. Conditions under which this joint will be used. (2\

2.6FOUR precautionary measures that must be taken into account when working wit h glass fibre. Catalyst and accelerator should always be stored separately. (Explosion\ Remove all resin catalyst and accelerator from skin.

2.7FOUR properties of Vesconite that makes it suitable to be used in marine appl ications. Vesconite has the lowest rates of wear. Even in dirty and un lubricated conditions. Vesconite gives long life with low maintenance and low friction.

2.8.1Explanation of the function of the electric wires shown by arrow A. The function of the wires is to connect both the positive and the negative wires adjacent to the gate to the wires on the other side of

2.8.2Name of the component of the electric fence shown by arrow B and an explanation of its function. Earth return spike/Ground spik The negatively charged spi ke creates a path through the ground when an animal touches the positive wires of the fence. The animal

2.8.3FOUR safety precautions applicable to electric fencing on the farm. Install war ning signs. No barbed wire must be electrified. Electric fences shall be installed and operated so that they cause no electrical hazard to persons, animals or their

2.8.4The procedure that must be followed when the earth system o an electric fence is being tested. Firstly short out the live fence line to ground. Switch the energizer ON. Measure the voltage between the

3.1.1Explanation of how electricity is generated with the solar panel. There needs to be some form of solar cell or panel. The solar panels are made of a semi conductive material; the mo st common material is silicon.

3.1.2FOUR possible reasons for a solar panel not w orking to its full potential. Some electrons may be lost. When the electrons release heat; the panel also becomes warm, interfering with other aspects of the solar cells.

3.2Explanation of the working of a geothermal power station from the moment that a geo thermal energy source is discovered to the point that electricity is delivered by the power station. Deep holes are drilled into the earth into the geothermal hot spot.

3.3THREE advantages that wind as an alternative energy source has to a farmer that has no access to the natio nal electricity grid. Wind power has no fuel costs. Low or negligible maintenance costs. Wind power has no clean

3.4TWO types of vegetable oils that can economically be used to manufacture bio fuels Canola o unflower oil. Peanut oil.

3.5e alternati fuel that can be manufactured from methane gas to supplement gasoline Met anol. (1\ [20]20

4.1.1The steps that must be followed when replacing the damaged contact tip on the MIG hands Unscrew the welding shield cup Unscrew the bad welding tip e a new tip into place. crew the new tip on Replace

4.1.2THREE disadvantages of MIG we ldi Higher initial setup cost. No gas, no welding. Har mful fumes. Difficult to move around. Atmosphere surrounding the welding process has to be stable

4.2.3ness of sketch Any Appl icable measurement. Any Applicable welding joint. 3000mm mm (1\ (1\ (1\

4.2.5Material list Pflat bar 2 of 000mm = 6m 100mm = 4,2m 10,2m Round bar 13 of

4.3Explanation of the term hard facing of a worn part. It is th e process by which worn parts can be built up by padding with a wear resistant metal. The type of hard facing and type of electrode used are determined by the

4.4Description of the overhead arc welding process from the moment that the arc is struck. Use an arc as short as possible. When molten metal starts dripping, the amperage should be reduced slightly. Move electrode slightly faster.

4.5.1FOUR advantages of the plasma cutting apparatus. Faster cutting speed. Wide range of materials and thickne Easy to utilize. Economical. (4\

4.5.2Description of the cutting process when using an oxy acetylene apparatus. First bring the material up to red hot. Oxygen is then fed with the lever on the cutting attachment. The steel actually ig nites giving of more heat to keep the

4.5.3THREE types of metals that can be cut with an oxy acetylene cutting apparatus. Mild steel. Cast iron /Iron Stainless steel.

5.1FIVE safety precautions regarding the use of a ride on rotary lawn mower. Read an d understand the operator's manual. Remove all debris from lawns before mowing. Use recommended PPE. Disengage the blade before starting.

5.2Part fitted between the tractor and the baling machine O (Power Take Off shaft\ (1\

5.2.2Description of the maintenance of the baling machine at the end of the baling season. Remove all bales from baling chamber. Clean the baler properly. Drain and replace all oil. Releases the tension on all drive belts.

5.2.3Description of the working and construction of the univ ersal joint that is installed in the drive mechanism of the baling machine. It allows the shaft to work at an angle. It is commonly used in shafts that transmit rotary motion.

5.2.4The type of hydraulic cylinder that will be suitable for the lifting and lowering of the machine's pick up wheel with a motivation. A double acting cylinder. This type of cylinder allows both push and pulls forces

5.3.1fun ction of the bearing shown Constrains relative motion between moving parts. Provides for free linear movement of the moving part. For free rotation around a fixe d axis/shaft. It is machine part that allows one part to bear (i.e., to support\

5.3.2Description of the aspects that must be considered when maintenance and lubrication is carried out on bearings. Bearings require periodic maintenance to prevent premature failure. Bearings need periodic lubrication and cleaning.

5.4HREE precautionary measures for the safe transportation of tractors on public roads. Watch out for traffic hazards. Know equipment clearance requirements. Know the size and weight of the equipment. Secure tractor.

5.5.1Calculation of the gear ratio if the large drive gear has 54 teeth and the small driven gear has 18 teeth. (Show all lculations\. Gear Ratio = Drive gear Driven gear The gear ratio is 1:3 (4\

5.5.2The direction that the small gear will turn if the large gear turns clock wise. Anti ckwise (1\

5.5.3How to asist the two gears to turn in the same direction. Install idler gear between the two gears (1\

5.6THREE reasons for installing a differential in the rear axle of a tractor. Changing direc tion of ro tion Speed reduction Dividing rotation equal between the rear wheels To change the drive system in a ninety degree angle.

5.7TWO running expenses associated with a tractor that must be considered when drawing up a farm budg et. Repairs /Maintenance Oil. Fuel. Grease. Labour.

5.8Explanation of why it is better for the operator to keep the loaded bucket low to the ground rather than raised up to the highest point. In the raised posit ion, the tractor is less stable and the potential for side

6.1Identification of the instruments shown below as used in irrigation schedul ing. Evaporation pan Anemometer Windspeed meter (2\

6.2THREE problems associated with irrigation on commercial farms. Competition for surface water rights. Depletion of underground aquifers. Lack of rain. Expensive to maintain/repair. Ground subsidence. Water rights.(Legislature\

6.3TWO instances where a travelling sprinkler gun may be used more effectively than a side roll irrigation system. Sport fields. Parks. Gardens. Cemeteries. Small farms. Pasture s with obstacles.

6.4.1TWO reasons for dividing irrigation fields into zones. The crop that is planted has different water needs because it is not planted at the same time. There is not enough water available to run the system over the

6.4.2The type of irrigation control system can be used on the centre pivot to apply water efficiently to the different zones? Computer technology/ Variable flow technology/Irrigation timer. (1\

6.5THREE reasons for a centre pivot to run out of line. Mechanical failure. Electrical failure on one of the towers. Get stuck in the mud. Wheel puncture. Structural failure. Strong winds. Any (3\

6.6THREE methods a farmer can use to test the moisture content of soil. Feel met hod Gravimetri tron probe Moisture meter. (3\

6.7.1FIVE components of a home sewerage treatment system Manhole House se wer/Toilet/Kitchen sink/piping system. Septic tank. Distribution box. Absorption field. Cesspools. (5\

6.7.2Explanation of what causes the destruction of micro organisms in a home sewerage treatment system. Excessive quantities of detergen ts, laundry waste, bleach, household chemicals, and caustic drain openers.

6.8Description of French drainage system. Installed around the foundation perimeter of a house or building to channel the water away from the structure. (2\

6.9Explanation of TWO r easons for the farmer to be able to determine the flow rate in a water pipe delivery system. For correct calibrating of the sprayers. Effective scheduling of irrigation. To prevent the over utilisation of the water source.

Topics Identified

Plant ProductionAgricultural ManagementSoil Science

Mark Allocation

Total200 marks

Sections20 + 10 + 10 + 35 + 20 + 35 + 40 + 30 = 200 marks

Paper information

SubjectAgricultural Technology

Year2019

SessionNovember

TypeMemo

PaperSee title

LanguageEnglish

Pages15

Downloads5

Examination context

Decade2010s

Years ago7y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2019

Days since exam2,548

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