Agricultural Technology Memo 1 (English)

November 2017 — Grade 12 / Matric — Agricultural Technology

Memo 2017 Grade 12 English

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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\ (10 (20\

1.2.1eated / heat (2\

1.2.2/steam /thermal (2\

1.2inverter (2\

1.2.4movable (2\

1.2.5reduces/decrease revent /stop (2\ 2\ (10\

1.3.1(2\

1.3.2(2\

3.3(2\

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1.3.5(2\ (10\ TOTAL SECTION A:

Q2— Section header —

2.1.1he minimum size of the war ning sign for an electric fence. 100 mm x 200 mm

2.1.2he minimum distance between two separate electric fences with dif ferent energizers. (1\

2.1.3depth that the earth electrode must penetrate into the soil when a high output energizer is used (1\

2.1.4Signs that show that an isolator is cracked. It will make sparks and thereby cause interference Visually see (2\

2.1.5A method of protecti electric fence wire against rust. Galvanizing copper coating (1\

2.1.6neat, labelled freehand drawing o f an electric fence with all the various components. One label Correct layout Components

2.1FOUR precautionary measures that must be follow when working with glass fibre. Catalyst and accelerator should always be stored separately. To avoid e

2.2THREE use of glass fibre products on a farm. Lawnmower body Tractor and other machine cover parts Drinking troughs Feeding troughs Water proofing (Any

2.3he term flammability of an adhesive. The adhesive must comply with the same properties if is used to join synthetic materials where it is subjected to open flames or heat (2\

2.4TWO pplications of esconite on a farm Bushes ear strips (2\ The melting point of eflon.

2.5A method of reducing magnetism in tainless steel if yo u also require tensile strengt Add hromium or anganese

2.6.1The metal that is added to opper to form ronze. Tin (1\

2.6.2TWO uses of hosphor ronze as a opper alloy. Phosphor bronze is particularly suited to precision grade bearings.

Q3— Section header —

3.1.1THREE environmental fact that must be considered before purchasing a wind turbine for use on a farm Surrounding topography Average wind speed Reliabilit y factor of the prevailing wind

3.1.2FOUR dvantages of using wind energy to generate electricity on a farm Wind powe r has no fuel costs Low maintenance costs No taxation on

3.1This device can be installed in the wind turbine to increase the speed of the input shaft that drives the generator. Gearbox (1\

3.2FIVE technical factors that can prevent photo voltaic system from function ing effecti

3.4THREE plants that can be used to anufacture biodiesel. Sunflower seed Soya beans Canola

Q4— Section header —

4.1.1TWO types of ga that c be used when cutting with the plasma cutting machine. Argon

4.1.2he po larity of the plasma cutting machine earth clamp Positive (1\

4.1.3TWO important personal safety item that must be worn for protect ion when performing plasma cutting. Fireproof gloves

4.2THREE types of metals that can be cut with an oxyacetylene cutting set. Mild steel Cast iron Stainles steel (3\

4.2procedures that must be follow ed to successful weld with the oxyacetylene apparatus

4.3he ty pe of shrinking that occurs at A and B A: Lateral shrinking : Angular shrinking (2\

4.6THREE disadvantages of MIG welding. Higher initial setup cost. Atmosphere surrounding the welding process has to be stable (hence the shielding gases\, therefore this process is limited to draught free

5.1.1Name of c omponent A Cyclone Dust/air outlet (1\

5.1.2he function of component It separates the grounded mat erial effectively from the air/ dust release. It separates the dust and grounded material (Any (1\

5.1.3he function of the components of the hammer mill. A Screens: Determine the size of the final grounded product B Hammers: Pulverize the fodder C Fan: Blow the pulverized material through the screens

5.2TWO essential personal protection clothing that must be worn when using the push lawnmower Safety b oots/shoes Long pants

5.3he differences between ale A and Bale B under the following headings in table form BALE BALE

5.3.1Storage space Storage space optimally utilized Loss of space between bales

5.3.2Bale handling Bales handled manually Bales handled with tractor

5.3.3Rope cons umption Low rope consumption High rope consumption (6\

5.4TWO functions of the slip clutch To p revent heavy objects from being taken into the baler. To p rotect the pick up if it is impeded by anything. To p

5.6mechanism that is used to hitch an implement to the trac tor. Three point mechanism. (1\ he names of components A, B an d C and the

5.7The reason for removing the air from hyd raulic system. Air is compressible and will influence the operation of the system. Air lock (Any

5.7.2ecause of the area that is subjected to the oil pr essure in the cylinder is larger on this side Where this type of cylinder can be used and an explanation for the

5.1An explanation of w hat will happen the load on the left han d side if pulley A on the right hand side is turned clockwise

6.1Explanation of the basic steps that a farmer should follow in selecting a pump for a specific irrigation

6.2.1The design principles that are incorporated into the sprayers of the centre pivot system to ensure the equ al distribution of water from the centre of the pivot to the outer end of the pivot. The holes of the sprayer nozzles are small near the centre and gets

6.2.2The calibration of the water distribution system on a centre pivot is necessary by referring to the movement of the centre pivot and the lay out of the land. The centre pivot move in a circle This means that the outer circle wheels cover a greater distance

6.2.3TWO common soil problems when water distribution is not correctly calibrated in an irrigation system. Soil can be washed away /Soil erosion Over or under irrigation Salination

6.3.1A device that can be used to determine soil water content and the necessity for such a device in irrigation management. Neutron Probe. Soil water content must be determined to ensure optimum plant growth

6.3.2Explanation of reason for measuring a crop s evapotranspiration The reason for measuring the tempo of water evaporation is to correctly calibrate water scheduling of the cent re pivot irrigation system

6.4Calculation of the flow rate of water in a pipe delivery system when it akes 5 min utes to fill a 15 000 litre tank. Show ALL calcu lations. Flow rate =

6.5.1The name of the ater purification system. Under c ounter water purification system or faucet purification system or h ousehold filtering system (1\

6.5.2Description of the working of the water purific ation system. Water is sent through three different size membranes. The first membrane catche the bigger particles and

6.5.3he name of the process when water is cleaned by sending it through different liquids, separated by a thin permeable film which only allows water to pass through on a molecular level. Reverse osmoses (1\

6.6Description of the br eakdown proc s of household sewerage in the septic tank. Sewerage is anaerobically broken down by bacteria. Very little solids remain when the watery sewerage flows to second tank.

Topics Identified

Plant ProductionAgricultural ManagementSoil Science

Mark Allocation

Total160 marks

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

Paper information

SubjectAgricultural Technology

Year2017

SessionNovember

TypeMemo

PaperPaper 1

LanguageEnglish

Pages13

Downloads3

Examination context

Decade2010s

Years ago9y

SeasonSpring (SH)

Start daySunday

Exam periodNovember 2017

Days since exam3,277

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