Agricultural Technology Memo 1 (English)

November 2022 — Grade 12 / Matric — Agricultural Technology

Memo 2022 Grade 12 English

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🎯 200 marks 📄 16 pages 📝 97 items found 📚 3 topics

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Q1— Section header —

1.1.10/D 20

1.2.1eat steam/ warmth/magma

1.2.2moveable

1.2.3standardis ation

1.2.4more

1.2.5Battery/Accumulator 10

1.3.4/H

1.3.510 TOTAL SECTION A: 40 Agricultural Technology DBE/November 2022

Q2— Section header —

2.1he alloy metal that is specifically used to manufac ture the products and reason why the metal is used.

2.1.1Wine tanks Stainless steel. Resistant to air, water and many chemical acids and alkali. Resistant against corrosion. Can be welded well. (Any 1\ (2\

2.1.2Fitt ings for hot water copper pipes Brass. Strength Machinability Wear resistance Hardness

2.1.3Hammers that can be used in explosive atmosphere Bronze Does not generate sparks Low friction (Any 1\ (2\

2.2ONE example where the following materials will be used on a farm.

2.2.1High tensile steel Tow bar Shafts Gears rowbar (Any 1\

2.2.2Cast iron Engine block Differential of the tractor Cast iron pots Tractor weights Brake drum Hubs for farm e quipment (Any 1\

2.3

2.4.1The TWO most important aspects that must be considered when an adhesive is chosen to repair the water trough. Type of the material to be joined. Conditions under which this joint will be used. (2\

2.4.2Pro es of preparing the water trough before the adhesive is applied. Clean the surface area around the crack and sand it lightly until

2.4.3TWO methods used to join fibre glass parts. Pop rivet Bolt and nut Screws (2\

2.4.4TWO methods of colo ring a fibre glass trough. Painting Dying (2\

2.5The effect of extreme heat on the following material.

2.5.1Bakelite No effect. Will become extremely hot. Will discolour (Any 1\ (1\

2.5.2Perspex It will easily change shape when heated, because Perspex is not heat resistant. It will burn. It will melt (Any 1\ (1\

2.5.3Silicon Silicon will melt. Will deform. (Any 1\ (1\

2.6Description of the friction ability of V esconite. Low static and dynamic friction No iction in tough working environments

2.7.1THREE design requirements prescribed for warning signs on electric fences. The signs must be at least 100 mm x 200 mm. The background color of both sides must be yellow. The ins cription must be black and must read

2.7.2TWO situations where an electrical fence can be used on a farm. Protection Temporary fences Dangerous animals, e .g.lions Around the farm perimeter (Any 2\

2.7.3TWO alternative energy sources that can be used to provide energy for an electrical fence. Wind Solar Hydro electric Generator Battery (2\

2.8THREE components needed to create a fire. Material that can burn Oxygen Any h eat source

2.9TWO reasons for using resin casting as an insulating material when joining THREE phase electrical wires. Watertight Non conduct or of electricity Toughness

Q3— Section header —

3.1.1The energy source that makes use of a generator. Source C (1\

3.1.2Description of the working principles of energy source B. Cold water passes through glass tubes where it is heated by sun energy. The heated water enters the geyser through a closed copper pipe network that

3.1.3The device that must be connected to energy source A to change the direct current to alternating current. Inverter (1\

3.1.4Identify energy source C. Concentrated solar /Solar plant /Sun tower (1\

3.2TWO disadvantages of a wind turbine s blades turning to fast. The blades could be damaged. The rotor experiences too much strain. The structure could collapse. Noise

3.3THREE geographical challenges that m ay arise during a survey for a eothermal energy power station. Is the rock soft enough to drill through? Do the rocks deep down contain sufficient heat? Will this heat be sustainable for a significant amount of time?

3.4.1n alternative racing fuel that can be used to supplement petroleum. Methanol (1\

3.4.2THREE materials used to manufacture the alternative fuel (Methanol\ Woody plant fibre Methane gas in landfills Coal Natural gas Fermented waste products such as sewage and manure

3.5.1THREE disadvantages associated with a hydroelectric power plant. Limited plant locations High initial costs Carbon emission Flood risk Susceptible to earthquakes/tremors Limited water resources Affects marine life

3.5.2TWO reasons why hydroelectric power plants are limited in South Africa. Water scarcity Inadequate water flow Non sustainable water in rivers Inadequate land gradient

Q4— Section header —

4.1.1Parts A and B. Earth clamp /Clamp Welding /gun

4.1.2The apparatus that can be attached for welding aluminium. Push Pull torch (1\

4.1.3TWO gas es that can be used with MIG welding. Argon Helium Mixture of Co2 and Argon (Any 2\ (2\

4.1.4THREE different metals that can successfully be welded with the MIG welding machine. High alloy steel (stainless alloys\ Aluminium Mild steel (3\

4.2.1The material used for part A. Tungsten Copper mounted hafnium Zirconium (Any 1\ (1\

4.2.2Description of the plasma cutting process. The process involves using a tungsten electrode, and high pressure plasma (which is gas in an ionized state\to generate and carry an electrical arc between a copper nozzle and work piece.

4.3TWO types of metals that can be cut by using the oxy acetylene. Mild steel Cast iron Stainless steel Any ferrous metals (Any 2\ (2\

4.4Description of the process of shutting down an oxy acetylene flame and bleeding the system. Turn off the acetylene valve on the torch handle. This will extinguish the flame. Turn off the oxygen valve on the torch handle.

4.5.1Description of the process of vertical up arc welding. A special electrode is used for vertical welding with an arc welder, makes th e process easier as it freezes more quickly. Amperage can be reduced slightly from the normal down hand

4.5.2Draw THREE different types of welding runs used for vertical welding. (Any 3 drawings\ (3\

4.6.1Calculation of the volume of concrete needed. Formula: Volume= Length x width x height 500 mm x 1 200 mm x 250 mm

4.6.2Design and sketch of a shelter to protect the generator from weather conditions. Show at least TWO measurements. Roof and construction (2\ Po les (Uprights\ (1\ Measurements (1\

Q5— Section header —

5.1.1TWO measures the farmer can apply to ensure that the maize will be harvested on time. Making use of contractors. Working longer hours. Making use of bigger harvesting machines. Harvest until the rain start.

5.1.2An alternative method that can be used, other than the combine harvester and justification. Hand harvesting You can continue to harve st by hand whilst it is raining/ Use a tractor drawn harvester

5.2.1THREE aspects to bear in mind when buying a new baler. Price Local maintenance services Parts locally available Driving power needed for operation Type of baler Ease of operation

5.2.2THREE points to consider before buying a second hand baler. Reliability of the agent. Spare parts easily available. Well proven model. Guarantee from agent/seller.

5.3.1ess space consuming bale (1\

Q5— Section header —

5.3.3The bale that can be wrapped. A or (1\

5.3.4A reason why baling process B can be used up until raining. Water runs down the bale/ bale can be stored outside. (1\

5.3.5FIVE round baler safety tips to young upcoming farmers. Familiarise yourself with the operator s manual. Adequate training must take place. Ensure all safety screens are in place.

5.4.1he type of belt best fitted on the pulley system and ONE reason for identifying it. belts AND Do

5.4.2Changing the direction in which pulley A rotate By twisting the belts. Switch the motor to the other side. Change the polarity of the motor. (Any 1\ (1\ Agricultural Technology

5.5.1The different types of gears, A and B. Straight cut gear/ Spur gear Helical gear (2\

5.5.2

5.5.3ONE advantage and ONE disadvantage of each gearing system. GEAR ADVANTAGE DISADVANTAGE Spur gear

5.5.4The gear system to improve speed. (2\

5.6.1Cylinder types. Double action cylinder

5.6.2he cylinder best fitted on a front end loader. Double action cylinder (1\

5.6.3Explanation to support answer given in QUIESTION 5.6.2. It enables the operator to set the control lever in a down and upward thrust position. (2\ Agricultural Technology 14 DBE/November 2022

5.6.4TWO reasons to justify the use of transmission oil in a tractor hydraulic system. Not compressible Good lubrication qualities Not volatile Relatively cheap (Any 2\ (2\

Q6— Section header —

6.1Irrigation components and their function.

6.1.1Irrigation timer Irrigati on controller/ Smart controller (1\

6.1.2An irrigation timer controls the flow of water by turning on and off. Used for scheduling irrigation. (Any 1 \ (1\

6.1.3Electronic valve/ Solenoid valve/ Irrigation valve (1\

6.1.4An irrigation valve regulates the one directional flow of water in an irrigation system. (1\

6.1.5Sprinkler /sprayer (1\

6.1.6An irrigation sprinkler drops water onto the land, mimicking the effects of rain. (1

6.2.1TWO reasons for determining the flow rate of the pump. For correct calibrating of the sprayers. Effective scheduling of irrigation. To prevent the over /under utilisation of the water source. (Any 2\

6.2.2

6.3Type of device suitable to send the location. GPS Cell phone Tablet Tablet (Any 1\ (1\ Agricultural Technology 15

6.4.1he irrigation system, best suitable for a land against steep slopes with motivation. AND Prevents run off water. Pivots mainly used on level surfaces. Does

6.4.2Reasons for preferring irrigation system A. Not necessary to remove system. Can work with implements on land. Animals cannot damage system. Less time consuming. Less labour intensive Remote control/management

6.5.1The design error of the septic tank. The outlet is higher than the inlet. No partition wall There will be a backflow of waste water. (Any 2\ (2\

6.5.2The importance of installing a manhole in a septic tank. General maintenance Removing of solids Inspection Adding bacteria Unclogging of in/outlet (Any 4\ (4\

6.5.3Suitable drainage system to be connected to the septic tanks outlet. French drain Pebble/stone drain Drainage field (Any 1\ (1\

6.6The main cause of bloc kages in a town s sewage system. The disposal of non degradable materials. The lack of maintenance. Missing

6.7.1The type of filter to connect with a water softener. (1\

6.7.2The filter that is installed to a micro irrigation system. (1\

6.7.3ONE example where the filter shown in C will be used. Micro irrigation Swimming pool (Any 1\ (1\

6.7.4Correct statement. Filtration always takes place from the outside to the inside of the filter. (2\ [30]30

Topics Identified

Plant ProductionAgricultural ManagementSoil Science

Mark Allocation

Total160 marks

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

Paper information

SubjectAgricultural Technology

Year2022

SessionNovember

TypeMemo

PaperPaper 1

LanguageEnglish

Pages16

Downloads5

Examination context

Decade2020s

Years ago4y

SeasonSpring (SH)

Start daySaturday

Exam periodNovember 2022

Days since exam1,451

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