Civil Technology Nov 2018 (Civil Services) FINAL Memo Eng_hlayiso.com_.pdf

Downloaded from hlayiso.com GRAAD 12 NATIONAL SENIOR CERTIFICATE GRADE 12 CIVIL TECHNOLOGY: CIVIL SERVICES NOVEMBER 2018 MARKING GUIDELINES MARKS: 200 These marking guidelines consist of 18 pages. Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Civil Services 2 DBE/ November 2018 NSC – Marking Guidelines QUESTION 1: OHSA, MATERIALS, TOOLS, EQUIPMENT AND JOINING (GENERIC) 1.1 1.1.1 F (1) 1.1.2 A (1) 1.1.3 G (1) 1.1.4 E (1) 1.1.5 B (1) 1.2 • Do not throw any tools or materials from a scaffold.  • Never jump on to and off a scaffold.  • Never overload a scaffold. • Remove or cover sharp edges or corners. • Always attach free-standing scaffoldings to a building. • Use a ladder to get on and off a scaffold. • Keep free of waste or any other obstruction. • Never jump on a scaffold while working on it. • Responsible/qualified person must ensure that scaffolding is safe, rigid, stable and firm or has no defects. • Scaffold must be supplied with guard rails/toe boards. • Scaffolds must be levelled on uneven ground. • Do not work on a scaffold in bad weather. • Wear a safety harness when working on scaffolding. • Do not throw tools on/off a scaffold. ANY TWO OF THE ABOVE (2) 1.3 • It prevents workers from falling off the scaffold.  • It is used as a handrail.  • It is used to strap on safety harnesses. • To protect the worker working on the scaffold. ANY TWO OF THE ABOVE (2) 1.4 • The primary purpose of painting is to protect metals, wood and other material against corrosion and decay.  • Provides a decorative/aesthetic appearance/finishing.  • Protects surfaces from moisture penetration. • Protects surfaces from rust/uv rays. ANY TWO OF THE ABOVE (2) Copyright reserved

Downloaded from hlayiso.com Civil Technology: Civil Services 3 DBE/November 2018 NSC – Marking Guidelines 1.5 The curing of concrete: • Increases the strength of concrete.  • Decreases the permeability of hardened concrete. • Improves durability of concrete by reducing cracks. • Makes concrete more watertight. • Minimises shrinkage cracks in concrete. • Provides volume stability. • Cured concrete can carry more weight without breaking/crumbling than uncured concrete. • Prevents rapid drying of concrete. • Curing ensures that the hydration process continues. ANY ONE OF THE ABOVE (1) 1.6 1.6.1 Multi detector  (1) 1.6.2 Tool A is used: • to detect materials found in/behind walls, ceilings and underneath floors, including ferrous and non-ferrous metals, electrical wiring, wood and metal studs.  • to locate steel bars and copper pipes.  • in carpentry, plumbing, and construction. • to measure the distance to/from covered objects. ANY TWO OF THE ABOVE (2) 1.6.3 The batteries must be removed from the tool: • to prevent the battery from running flat/battery can die.  • to prevent acid leaks from batteries damaging the tool. ANY ONE OF THE ABOVE (1) 1.7 1.7.1 A – Bolt and nut/Bolt  B – Rawl bolt  (2) 1.7.2 Bolt and nut • Bolts and nuts are used to secure pipe supports to metal parts.  • To join components together. Rawl bolt • A Rawl bolt is used to fix a truss hanger to a wall.  • To fix brackets/structures/panels to a wall/concrete. • For construction, renovation and industrial work ANY TWO OF THE ABOVE (2) [20] Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Civil Services 4 DBE/November 2018 NSC – Marking Guidelines QUESTION 2: GRAPHICS AS METHOD OF COMMUNICATION (GENERIC) ANSWER SHEET 2 NO. QUESTIONS ANSWERS MARKS 1 Identify FIGURE A. South Elevation/Elevation  1 2 Identify FIGURE B. Ground floor plan/Floorplan  1 First floor level/Second floor 3 Identify number 4. level/Suspended floor/Floor level/ 1 Dash line/ FFL/Expansion joint  4 Identify number 5. Window Sill  1 Hand wash basin/Wash 5 Identify number 9. 1 basin/Washing basin/HWB/Basin  6 Identify number 10. Water closet/WC/Toilet pan  1 7 Identify number 11. Bath/B  1 8 On what date was the plan printed? 2018/10/02  1 9 Who drew the building plan? JP Maloi  1 Name the feature in the column for the 10 notes in FIGURE 2 that must be Ramp  1 installed in front of the sliding door. Name the feature in the column for the 11 notes in FIGURE 2 that must give Staircase/Stairs/Stairway 1 access to the first floor. Identify the type of roof that is used for 12 Gable roof  1 the building in FIGURE A. To cover the opening/close the gap between the two slopes of the roof.  13 Explain the purpose of number 1. Prevent water and other elements 1 from entering the roof. ANY ONE OF THE ABOVE Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Civil Services 5 DBE/November 2018 NSC – Marking Guidelines • To prevent water from falling onto the ground  • To collect rainwater • To channel the rainwater into the downpipe 14 Explain the purpose of number 2. • To protect the wall from water 1 • To hide the rafters/finish off the roof ANY ONE OF THE ABOVE Explain the abbreviation FFL at 15 Finished floor level  1 number 6. To channel the water from the gutter 16 Explain the purpose of number 7. 1 to the ground.  Explain the meaning of the arrow on It indicates the direction of the slope 17 the feature that must be installed in 1 of the ramp/it indicates the slope.  front of the sliding door. It indicates the slope or the gradient Explain what is meant by 1:10 of the ramp/for every 10 metres 18 1 indicated on the symbol in the notes. horizontally rises 1 metre vertically. 19 Which room will feature 15 serve? The bathroom.  1 • Indicates what direction the window is opening/window opening.  • Indicates the location of the Explain the short dash lines on the hinges. 20 1 windows. • Indicates the location of the casement stay. ANY ONE OF THE ABOVE Deduce the height of window 2 from 21 1,2 m or 1 200 mm (Ignore units) 1 the window schedule. Deduce the width of window 3 from 22 2 m or 2 000 mm (Ignore units) 1 the window schedule. On what elevation of the building is 23 Western elevation/Western side  1 the bathroom window situated? Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Civil Services 6 DBE/November 2018 NSC – Marking Guidelines 3 – window/window frame/reveal frame stile/casement stile  Differentiate between component 24 2 number 3 and component number 8. 8 – sliding door /door frame/ door/reveal /sliding door stile  The light in the lounge is a fluorescent light/1 x 40W/2x40/3x40 Differentiate between the light in the 25 fluorescent light  and the light in 2 lounge and the light in the bathroom. the bathroom is a normal ceiling light  Tile/ Vinyl flooring(Novilon)/ Coloured screed/Polished or stained Recommend a suitable floor covering concrete flooring/Water proof 26 1 for the bathroom. laminated floor/carpet.  ANY ACCEPTABLE ANSWER Recommend an appropriate scale to 27 which FIGURE A should be drawn, 1:50/100/200  1 according to SANS. Recommend an alternative sanitary 28 fitment to replace number 11 that will Shower  1 serve a similar purpose. Calculate the internal area of the office 4 m  x 3 m  = 12 m²  OR 12 29 3 in m² Show ALL calculations. 4 000 X 3 000 = 12 000 000mm2 Positive marking (220 + 3 000 + 110 + 2 800 + 220)  x 2  = 6 350 x 2 =12 700 mm  Calculate the perimeter of the building. (220 + 4 000 + 110 + 2 000 + 220)  x 2  30 = 6 550 x 2 7 Show ALL calculations. = 13 100 mm  12 700 + 13 100 mm = 25 800 mm  OR = 25,8 m TOTAL 40 Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Civil Services 7 DBE/November 2018 NSC – Marking Guidelines QUESTION 3: CONSTRUCTION ASSOCIATED WITH CIVIL SERVICES, OHS AND QUANTITIES (SPECIFIC) 3.1 3.1.1 A manhole is a chamber that allows entrance to a drain.  (1) Allow access to the sewage pipes of a sewage system. ANY ONE OF THE ABOVE 3.1.2 Benching/Sloping/Haunching  (1) 3.1.3 Pipe channel/Open channel/Channel  (1) 3.1.4 Manholes are set in frames and have greased double seals for the following reasons: • To make the manhole airtight.  • To make the manhole watertight.  • To ensure that gasses cannot escape. • To ensure that liquids cannot escape. (2) 3.2     √   √     Correctly drawn  A A ASSESSMENT CRITERIA MARK LEARNER MARK FIVE courses of bricks in stretcher 5 bond correctly drawn Alternate half bricks on left side 3 Section correctly drawn 1 Hatching lines 1 (10) TOTAL: 10 Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Civil Services 8 DBE/November 2018 NSC – Marking Guidelines 3.3 • If the sides are not properly supported, no person is allowed to work in the trench.  • The supervisor ensures that no load, material or heavy machinery is placed near the edge of any excavation.  • Excavations must be adequately protected by a fence.  • Red warning lights and signs should be placed at regular intervals and be clearly visible. • Orange warning signals must always be visible. • Deep trenches should have shoring. • Wear a harness. • Any person entering an excavation trench must wear personal protective equipment. (3) ANY THREE OF THE ABOVE 3.4 3.4.1 Shoring A  (1) 3.4.2 Vertical members/poling boards are closer together. This means loose or waterlogged soil cannot filter through the openings.  The loose or waterlogged soil will easily filter through the openings of B. ANY ONE OF THE ABOVE (1) 3.5 3.5.1 Manhole  (1) 3.5.2 Lifeline  (1) 3.6 A B C D 3.6.1 Volume of concrete for foundation: Volume = l x b x h 1/ 1,150  1,0  0,125  0,14 m³  0,14 m³ of concrete is needed (4) 3.6.2 Number of bricks needed for the manhole: 1/ Centre line of wall = 4,96 m 4,96  1,0  496 bricks are needed 100  496  (4) [30] Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Civil Services 9 DBE/November 2018 NSC – Marking Guidelines QUESTION 4: COLD AND HOT-WATER SUPPLY, TOOLS, EQUIPMENT AND MATERIALS (SPECIFIC) 4.1 4.1.1 High pressure geyser/Electrical geyser  (1) 4.1.2 Element  (1) 4.1.3 Gas geyser/Solar geyser/Coal/Biofuel/Wood geyser/Donkey/Solar panel  (1) 4.2 4.2.1 A dripping geyser overflow may be an indication that the pressure control/relief valve/vacuum breaker is faulty/pipe joint leakage.  (1) 4.2.2 If there is no hot water, one of the following may be the cause: • No power to the geyser  • Circuit breaker is faulty • Electricity supply is interrupted • Thermostat may be faulty • Element may be faulty • Blocked hot-water pipe • No sun for solar geyser • No gas for gas geyser (1) ANY ONE OF THE ABOVE 4.2.3 If water is leaking through the ceiling, one of the following may be the reason: • Burst geyser or major leak.  • Drip tray outlet pipe is blocked or overflowing. • The drip tray may be cracked/no drip tray. • Pipe joint leakage. ANY ONE OF THE ABOVE (1) 4.3 4.3.1 F (1) 4.3.2 G (1) 4.3.3 E  (1) 4.3.4 D (1) 4.3.5 B (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Civil Services 10 DBE/November 2018 NSC – Marking Guidelines 4.4 4.4.1  (2) 4.4.2  (2) 4.4.3  OR (2) 4.5 • Cut the damaged section from the pipe, using a pipe cutter/.  • Move the pipe slightly sideways to allow the fixing of compression fittings.  • Measure and cut the length of pipe to be replaced.  • Slip the nuts over the pipes followed by the ferrules. Push the pipes into the fittings and tighten using the correct tools.  OR • Dismantle the joint • Ensure sealing of joint (thread sealing tape) (4) • Replace compression joint • Tighten all nuts properly • Test for leaks 4.6 4.6.1 P-Trap/Water trap  (1) 4.6.2 PVC/Plastic/Rubber (1) 4.6.3 B (1) 4.6.4 The seal will ensure a watertight seal and prevent it from leaking.  (1) 4.7 4.7.1 A Bibcock/Bib tap  (1) B Stopcock/Stop tap  (1) 4.7.2 A A bibcock can be used for sanitary fitments such as kitchen sinks, wash troughs, washbasins, dishwashers, washing machine, fridges, ice machines and baths.  (1) Outside of a house for hose pipes. ANY ONE OF THE ABOVE B A stopcock is used to close or shut off the water supply.  (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Civil Services 11 DBE/November 2018 NSC – Marking Guidelines 4.7.3 • Plastic taps do not have the same resale value as brass taps and is therefore not worth stealing/cheaper. • Plastic taps are cheaper than brass taps. (1) 4.8 • To enable local authorities/consumer to calculate the amount of water consumed by a household.  • To indicate if there is a leakage in water pipes. • To enable the user to upload pre-paid water coupons. (1) 4.9 4.9.1 Description of dezincification: • Dezincification is the selective leaching of zinc from copper alloys.  • It is an electrochemical reaction between zinc and water.  (2) 4.9.2 Problems caused: • Zinc gradually dissolves from the surface of an alloy.  • The material that remains is a weak, spongy copper layer.  • It can progress through the part/fitting, causing leaks.  • It can form blockages if it forms a deposit. (3) ANY THREE OF THE ABOVE 4.10 Electrolytic cleaning/chemicals/scrubbing with wire brush/sand paper.  (1) 4.11 Hydro-dynamic energy  (1) 4.12 • Drain cleaning rods  • Jetting machine/drain cleaning machine/plunger ANY ONE OF THE ABOVE (1) 4.13 Compressed-air test apparatus  (1) [40] Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Civil Services 12 DBE/November 2018 NSC – Marking Guidelines QUESTION 5: GRAPHICS AS MEANS OF COMMUNICATION, ROOF WORK AND STORM WATER (SPECIFIC) 5.1 5.1.1 Stop end  (1) 5.1.2 Pitch of the roof  (1) 5.1.3 Galvanised sheet metal  (1) 5.1.4 Gutter  (1) 5.1.5 Kerb  (1) 5.2       ASSESSMENT MARK LEARNER CRITERIA MARK Square gutter 2 Downpipe with offset 3 Holder bat 2 TOTAL: 7 (7) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Civil Services 13 DBE/November 2018 NSC – Marking Guidelines 5.3  7 4 6  2 5 5 1 1    5 4 5 7 2 5  6 4 5  3  Candidates can use any one of the 2 methods: 1. Calculate the circumference and divide by 12 C= 2 x3.14 x25 =157/12 = 13 1 mark OR 2. Measure distance between any 2 parts on top view(circle) ASSESSMENT CRITERIA MARK CM Construction lines to top of cone 1 2 Construction lines of outer circle 2 2 Divide outer circle in 12 parts 3 1 Construction lines from top of cone to outer circle 4 3 Cone measurement (marked/transferred) from front view to 5 determine top part of development (ONE mark for every FOUR coordinates = 3) 6 Outside lines of development 6 2 3 mm seam on both sides 7 2 TOTAL: 18 OR Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Civil Services 14 DBE/November 2018 NSC – Marking Guidelines 5.3  7 4 6  2 5 1 5 1    5 4 5 7 2 5  6 4 5  Candidates can use any one of the 2 methods: 3  1 Calculate the circumference and divide by 12 C= 2 x3.14 x25 =157/12 = 13 1 mark OR 2 Measure distance between any 2 parts on top view(circle) ASSESSMENT CRITERIA MARK CM Construction lines to top of cone 1 2 Construction lines of outer circle 2 2 Divide outer circle in 12 parts 3 1 Construction lines from top of cone to outer circle 4 3 Cone measurement (marked/transferred) from front 5 6 view to determine top part of development Outside lines of development 6 2 3 mm seam on both sides 7 2 TOTAL: 18 [30] Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Civil Services 15 DBE/November 2018 NSC – Marking Guidelines QUESTION 6: SEWERAGE, SANITARY FITTINGS AND JOINING (SPECIFIC) 6.1 6.1.1 B (1) 6.1.2 A (1) 6.1.3 A (1) 6.1.4 C (1) 6.1.5 B (1) 6.2 6.2.1 C Waste junction135°/Y-junction 135° (1) 6.2.2 • To allow access to the drainage system.  • To remove blockages from the drainage system. ANY ONE OF THE ABOVE (1) 6.2.3 • So that drain rods can be inserted easily into the pipe with the direction of flow.  • A 90° junction at this point will make it impossible to use drain rods. • A 90º junction will damage the main sewerage pipe if drain rods are forced into the pipe. ANY ONE OF THE ABOVE (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Civil Services 16 DBE/November 2018 NSC – Marking Guidelines 6.3 RE    RE IE IE  VP  IE  WB  WC  B  IE G S IE ASSESSMENT CRITERIA MARK CANDIDATE'S MARK 2 x rodding eyes correctly positioned 2 5 x inspection eyes correctly positioned 5 1 x ventilation pipe correctly positioned 1 MH Drain pipes drawn correctly (Main and 2 branch pipes) TOTAL 10 (10) 6.4.1 15 mm  (1) 6.4.2 Shower rose/head  (1) 6.4.3 To channel the water towards C.  (1) 6.4.4 • The shower trap allows water to flow down the drainage pipes.  • Keeps unwanted odours from entering the atmosphere. • To ensure that water flows to the shower trap. (1) 6.4.5 Capillary joint/Soldered joint  (1) 6.5 The function of an anti-siphonage pipe is: • To supply air to the short branch pipe of the lower fixture at the time of suction to prevent loss of the water seal.  • To act as a ventilation pipe for the lower fixtures. ANY ONE OF THE ABOVE (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Civil Services 17 DBE/November 2018 NSC – Marking Guidelines 6.6 FIGURE A: Used above ground where soil pipe must bend.  Where access to sewage pipes are needed/unblocking of pipes. To join sewage pipes at 90º. FIGURE B: Used to connect soil pipes at an angle.  To join three soil pipes at an angle of 135º (2) 6.7 • Water closet  • Bidet • Urinal ANY ONE OF THE ABOVE (1) 6.8 6.8.1 OR  (2) Urinal 6.8.2  (2) Grease trap 6.8.3  (2) Shower 6.9 Materials that are commonly used for sanitary fittings are: • Ceramics  • Cast iron  • Stainless steel • Plastic/PVC • Pressed steel • Terrazzo • Glass fibre/fibreglass (2) • Copper/aluminium ANY TWO OF THE ABOVE 6.10 • 50/50 solder (plain/tinman's solder)  • Wiping solder (plumber's solder)  • 60/40 solder (fine solder) • Lead-free solder ANY TWO OF THE ABOVE (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Civil Services 18 DBE/ November 2018 NSC – Marking Guidelines 6.11 Chemical anchors can be used to: • Mount air conditioners  • Fit outdoor lights • Fix brackets to walls • Fix brackets to secure I-beams • Fix balconies • Fix railings • Repair bathrooms ANY ONE OF THE ABOVE (1) 6.12 6.12.1 Rivet head  (1) 6.12.2 Flange is created by the rivet gun to complete the bond between the two pieces of material/keep/secure the two parts together.  (1) [40] TOTAL: 200 Copyright reserved