Civil Technology Grade 12 NSC Supplementary 2018 Memo (Eng)

Downloaded from hlayiso.com GRAAD 12 NATIONAL SENIOR CERTIFICATE GRADE 12 CIVIL TECHNOLOGY FEBRUARY/MARCH 2018 MARKING GUIDELINES MARKS: 200 These marking guidelines consist of 15 pages. Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology 2 DBE/Feb.–Mar. 2018 NSC – Marking Guidelines QUESTION 1: CONSTRUCTION, SAFETY AND MATERIAL 1.1 1.1.1 B (1) 1.1.2 E (1) 1.1.3 A (1) 1.1.4 D (1) 1.1.5 F (1) 1.1.6 C (1) 1.1.7 H (1) 1.1.8 I (1) 1.1.9 G (1) 1.1.10 J (1) 1.2 1.2.1 A – To protect your feet against falling objects.  (1) 1.2.2 B – To protect your feet when working with wet material.  (1) 1.3 The paint conceals defects  (1) 1.4  Excavations must be fenced off.   Red warning lights should be placed at intervals to warn the public.   All excavations must take place under supervision.  The contractor must test the stability of the terrain before commencement of excavations.  Shoring should be cross braced.  Bracing should be strong enough to support the shoring.  No tools or materials other than those in use are allowed inside the trench when excavations are in progress.  Access to the excavation should be safe e.g. ladders can be used.  A responsible person must inspect and investigate underground electricity and water supply.  The sides should be braced and protected if deeper than 1,5 meters. ANY TWO OF THE ABOVE OR ANY OTHER ACCEPTABLE ANSWER (2) 1.5  Baseplate   Mould/Cube   Tamping rod   Plaster trowel/straight edge/shovel ANY THREE OF THE ABOVE (3) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology 3 DBE/Feb.–Mar. 2018 NSC – Marking Guidelines 1.6  Water makes the fresh concrete workable.   Water acts as a lubricant.  Water is also needed for the hydration process. ANY ONE OF THE ABOVE (1) 1.7 1.7.1 To prevent moisture from getting into the building.  (1) 1.7.2 To prevent moisture from moving up in the walls.  (1) 1.8  Preservatives with a base of water-soluble salts.   Varnish ANY ONE OF THE ABOVE (1) 1.9 Roof tiles/Clay tiles/Concrete tiles  (1) 1.10 Ridge capping  (1) 1.11 Gang nails/plate connectors  (1) 1.12      ASSESSMENT CRITERIA MARK CANDIDATES MARK One brick wall 2 Half brick wall 1 (T-junction) Three-quarter bricks 2 TOTAL 5 (5) [30] Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology 4 DBE/Feb.–Mar. 2018 NSC – Marking Guidelines QUESTION 2: ADVANCED CONSTRUCTION AND EQUIPMENT ANSWER THIS QUESTION ON A NEW PAGE. 2.1 2.1.1 C (1) 2.1.2 D (1) 2.1.3 A (1) 2.1.4 B (1) 2.1.5 A (1) 2.2 2.2.1 Portable electric generator  – It is used to generate electricity  (2) 2.2.2 Portable electric circular saw  – It is used for cross cutting and ripping of timber.  (2) 2.3 Chalk line  (1) 2.4  Flat steel square   Tape measure ANY ONE OF THE ABOVE (1) 2.5  Rough arch will be built with common bricks   Gauge arch will be built with face bricks  (2) 2.6 2.6.1 Driven in-situ pile  (1) 2.6.2  Low bearing capacity of soil   Subsoil – subjected to movement   Subsoil – subjected to high moisture content.  Recently placed filling materials that is not sufficiently compacted  Unstable soil structure  High water table ANY TWO OF THE ABOVE (2) 2.6.3 Steel reinforcement  (1) 2.7 2.7.1 Twisted square bar  (1) 2.7.2 Round bar (mild steel)  (1) 2.8 A – Landing  B – Rise  C – Tread  (3) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology 5 DBE/Feb.–Mar. 2018 NSC – Marking Guidelines 2.9  Blow holes   Uneven colour/discoloration   Honey comb effect/Leaking of grout ANY TWO OF THE ABOVE (2) 2.10 2.10.1 Cavity wall  (1) 2.10.2  A – Wall tie   Keeps the two skins of the wall securely together.   It strengthens the wall ANY TWO OF THE ABOVE (2) 2.10.3  B – Weak concrete mixture   Concrete mixture ANY ONE OF THE ABOVE (1) 2.10.4  To strengthen the wall below the DPC (damp proof course)   To close the cavity below the damp proof course ANY ONE OF THE ABOVE (1) 2.10.5 C – Damp-proof membrane  (1) 2.10.6 50 mm  (Unit must be part of the answer) (1) 2.11 2.11.1 A – Cladding (or any cladding material)  B–  Timber floor board   Base plate  Base board ANY ONE OF THE ABOVE FOR B (2) 2.11.2  Steel   Metal  Aluminium ANY ONE OF THE ABOVE (1) 2.11.3  There is no wet material   There is no heavy material to carry   Dry walls are light in weight.  Dry walls are easier to install  Dry walls are easy to remove if required ANY TWO OF THE ABOVE (2) 2.12 2.12.1 Rib and Block floor  (1) 2.12.2 A – Rib  B – Hollow block/Block  C – Reinforcing steel/Steel rod/Reinforcement  (3) [40] Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology 6 DBE/Feb.–Mar. 2018 NSC – Marking Guidelines QUESTION 3: CIVIL SERVICES 3.1 3.1.1 P-trap  (1) 3.1.2 Washbasin/Urinal/Shower/Sink  (1) ANY ONE 3.2 3.2.1 A-Is the inlet pipe for cold water  B-Is the outlet pipe for warm water  (2) 3.2.2 To shut down water supply during maintenance.  ANY OTHER ACCEPTABLE ANSWER (1) 3.2.3  To prevent water from leaking through the ceiling   It is compulsory to install a drip tray ANY ONE OF THE ABOVE (1) 3.3 3.3.1 Storm water is hail, snow, rain that falls to the earth in large quantities.  ANY OTHER ACCEPTABLE ANSWER (1) 3.3.2 Storm water is guided into the channels where after the water is guided to storm water pipes and catchment areas.  ANY OTHER ACCEPTABLE ANSWER (1) 3.4 Water in shallow wells is:  Easily dug out   Cheap  Relatively reliable ANY ONE OF THE ABOVE (1) 3.5 Wind pump  (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology 7 DBE/Feb.–Mar. 2018 NSC – Marking Guidelines 3.6 C X   FRIDGE B A   ASSESSMENT MARK CANDIDATE'S CRITERIA MARK 2 way light switch 2 Socket outlet 2 Light 2 Electrical wire 2 TOTAL 8 (8) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology 8 DBE/Feb.–Mar. 2018 NSC – Marking Guidelines 3.7 ANSWER SHEET 3.7      IE IE IE  IE  MH  VP  G WHB S  WC SH   Conservancy tank ASSESSMENT MARK CANDIDATE'S CRITERIA MARK Rodding eye 1 Gully 1 Vent pipe 1 Main sewerage pipes 2 Inspection eyes 4 Manhole 1 Any TWO abbreviations for the 2 sanitary fixtures (12) TOTAL 12 [30] Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology 9 DBE/Feb.–Mar. 2018 NSC – Marking Guidelines QUESTION 4: QUANTITIES, MATERIALS AND JOINING 4.1 4.1.1  Gang nail  (1) USE:  Gang nails are used to join the members of roof trusses.   Extend the length of a timber board/beam. ANY ONE OF THE ABOVE USES (1) 4.1.2  Bolt and nut  (1) USE:  Bolts and nuts are used to join the members of roof trusses.   Join material to brackets  To fix truss hangers to rafters ANY ONE OF THE ABOVE USES (1) 4.1.3  Dry wall screw  (1) USE:  Drywall screws are used to fix dry wall materials.   Joining ceilings and battens to other members  Joining timber to each other ANY ONE OF THE ABOVE USES (1) 4.2  Rawl bolt/Expansion anchor   Sleeve anchor  Dina bolt ANY ONE OF THE ABOVE (1) 4.3  Compression joint   Capillary joint ANY ONE OF THE ABOVE (1) 4.4  Screws have greater holding power than nails   They can be fixed where vibration has to be avoided   Screws can easily be removed  The appearance of screws is better in finishing than nails ANY TWO OF THE ABOVE (2) 4.5 4.5.1 38 or 38 mm  (1) 4.5.2 2 349 or 2 349 mm  (1) 4.5.3 5√ (1) 4.5.4 2 575 or 2 575 mm  (1) 4.5.5 5 150 or 5 150 mm  (1) 4.5.6 4 500 or 4 500 mm  (1) 4.5.7 10 300 or 10 300 mm  (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology 10 DBE/Feb.–Mar. 2018 NSC – Marking Guidelines 4.6 A B C D Inside measurement of: Long walls = 6 500 – 2/220  = 6 060 mm  Short walls = 3 800 – 2/220  = 3 360 mm  (4) 1/ 6,06 Inside floor area of the room is 3,36  20,36 m2  (2) Area of one ceiling board: 1/ 3,9 One board is 3 900 mm x 900 mm 2 0,9  3,51 m  (3) Length of skirting: = 2(6 060 + 3 360 ) – 900 mm  = 17,94 m  OR 12 120 + 6 720 - 900 =17,94 m OR 6 060 + 6 060 + 3 360 + 3 360 - 900 =17,94 m (4) (13) [30] Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology 11 DBE/Feb.–Mar. 2018 NSC – Marking Guidelines QUESTION 5: APPLIED MECHANICS 5.1 5.1.1 (A1 x d) + (A2 x d) Total area     = (3 200 x 20) + (900 x 60) 4 100    = 64 000 mm + 54 000 mm3 3 4 100 = 118 000 mm3  4 100 mm2 = 28,78  mm  OR Part Area (A) Y AY 1 3 200 mm²  20 mm  3 200 x 20 = 64 000 mm3  2 900  mm² 60 mm  900 mm x 60 mm = 54 000 mm3  ∑ 4 100 mm²  118 000 mm3 Y  Ay A = 118 000 mm3  4 100 mm2 = 28,78  mm  (10) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology 12 DBE/Feb.–Mar. 2018 NSC – Marking Guidelines 5.2.1 60 N B 40 N C F G A 30° E 30° 60° 60° D 10 m RL = 45 N RR = 55 N a   b  g e d    f   c (8) 5.2.2 MEMBER NATURE MAGNITUDE FG Tie  23 N  (4) BF Strut  50 N  Tolerance of 1 N to either side NOT TO SCALE DUE TO ELECTRONIC TRANSFER USE A MASK TO MARK THIS QUESTION Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology 13 DBE/Feb.–Mar. 2018 NSC – Marking Guidelines 5.3 5.3.1 40 Nm  (1) 5.3.2 7m (1) 5.3.3 3m (1) 5.3.4 10 N 40 N 20 N 20 N/m 2m 2m 3m 3m A B C D E F RL = 66 N RR = 44 N 204 Nm   178 Nm  132 Nm 132 Nm   0 Nm 0 Nm A B C D E F (5) SCALE 1 mm = 2 Nm NOT TO SCALE DUE TO ELECTRONIC TRANSFER USE A MASK TO MARK THIS QUESTION If the bending moment diagram is not to scale, deduct 1 mark. Marks are allocated for each line between A to F. If the lines between B and D are straight lines no marks will be awarded for these lines. [30] Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology 14 DBE/Feb.–Mar. 2018 NSC – Marking Guidelines ANSWER SHEET 6.1 NO. QUESTIONS ANSWERS MARKS 1 Name the scale used for the West 1:100  elevation. 1 2 Identify number 1. Barge board  1 3 Identify number 2. Window/window pane/glass 1 casement  4 Identify number 3. Door/door opening  1 5 Identify number 4. FFL/Finished floor level  1 6 Identify number 5. Step  1 7 Identify number 6. NGL/Natural ground level  1 8 Identify number 7. Window sill  1 9 Name the material that can be Fibre cement  used for the soffit board at a closed 1 eave? 10 Recommend a suitable exterior Paint/plaster/face brick/ 1 finish for the wall. cladding  11 Deduce on which elevations will the North elevation  and South gutters be placed in this house? 2 elevation 12 Draw the roof lines for the roof of   the building shown in FIGURE 6.1 3 in the column alongside.  TOTAL 15 Copyright reserved Please turn over

Civil Technology Downloaded from hlayiso.com 15 DBE/Feb.–Mar. 2018 NSC – Marking Guidelines QUESTION 6: GRAPHICS AND COMMUNICATION ASSESSMENT MARKS LM CRITERIA ANSWER SHEET 6.2 Correctness of 3 drawing External wall 1 Symbol for wall 1  Plaster 2 Wall plate 1   Tie beam 1 King post Rafter Rafters 2 King post 1 Brandering 1  Ceiling board 1  Cornice 1 Fascia board 1 Print title and scale 2  Tie beam  Any FOUR labels 4    Application of scale: One or two incorrect  =3  Three or four incorrect =2   More than five Fascia board incorrect = 1 No measurement  correct = 0 3   TOTAL 25 SECTION B–B   SCALE 1:20 NOT TO SCALE: USE A MASK TO MARK THIS QUESTION Correctness of drawing  All parts of the drawing must be correctly drawn to receive a mark. [40]   If the section is drawn the wrong way around deduct 1 mark. 200 Copyright reserved