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T1160(E)(M30)TAPRIL EXAMINATIONNATIONAL CERTIFICATEMOTOR TRADE THEORY N1(11040651)30 March 2016 (X-Paper)09:00–12:00This question paper consists of 10 pages.Copyright reservedPlease turn over
(11040651)-2-T1160(E)(M30)TDEPARTMENT OF HIGHER EDUCATION AND TRAININGREPUBLIC OF SOUTH AFRICANATIONAL CERTIFICATEMOTOR TRADE THEORY N1TIME: 3 HOURSMARKS: 100INSTRUCTIONS AND INFORMATION1.Answer ALL the questions.2.Read ALL the questions carefully.3.Number the answers according to the numbering system used in this questionpaper.4.Start each question on a NEW page.5.ALL sketches must be provided with the necessary labels.6.Correct spelling and terminology is important. Do not use words like 'top' forcylinder head.7.Write neatly and legibly.Copyright reservedPlease turn over
(11040651)-3-T1160(E)(M30)TQUESTION 11.1Various options are provided as possible answers to the following questions.Choose the answer and write only the letter (A–D) next to the questionnumber (1.1.1–1.1.10) in the ANSWER BOOK.1.1.1A worn cylinder head gasket is likely to cause ABCD1.1.2During engine operation, the intake and exhaust valves are closedby the ABCD1.1.3excessive release-bearing wear.excessive clutch pedal wear.difficult gear selection.All of the above.The main function of a thermostat in the cooling system is toregulate the ABCDCopyright reservedServes as a mounting facility of the gearbox.Serves as a mounting facility for the ring gear.Serves as a mounting facility for the clutch assembly.Carries the engine through the non-firing strokes.Excessive clutch pedal free play can cause .ABCD1.1.6front to back.back to front.middle towards outer ends.ends to the middle.ONE of the following is NOT the function of the flywheel:ABCD1.1.5valve spring.camshaft.piston pressure.valve rockers.The conventional sequence for tightening cylinder heads is from ABCD1.1.4incorrect valve timing.engine misfiring.oil dilution.incorrect timing.engine pressure.engine speed.engine operating temperature.coolant pressure.Please turn over
(11040651)1.1.7-4-When the thermostat is closed the water circulates mainly throughthe ABCD1.1.8lubricate the oil pump.seal the oil pump.push upwards.limit the maximum speed.Two 12-volt batteries connected in parallel produce .ABCD1.2loaded.at operational temperature.hot.cold.A pressure relief valve is used in the engine lubricating systemto ABCD1.1.10radiator.water pump.engine.cylinder head.Tyres should be inflated to their recommended pressure when theyare ABCD1.1.9T1160(E)(M30)T12 volts.18 volts.24 volts.6 volts.(10)Safety sign regulations are established in accordance with internationalstandards.Name the precautions that each of the signs in FIGURE 1 below illustrates.Write only the answer next to the question number (1.1.1–1.1.3) in theANSWER BOOK.1.2.11.2.2Copyright reservedPlease turn over
(11040651)-5-T1160(E)(M30)T1.2.3FIGURE 11.3State FIVE unsafe acts that cause accidents in the workshop.1.4Name TWO types of fans used in the internal combustion engine.(3)(5)(2)[20]QUESTION 22.1Give THREE reasons for a low engine oil pressure although there is enoughoil in the sump.(3)2.2Name THREE functions of the piston.(3)2.3FIGURE 2 below shows a sketch of the parts of the internal combustionengine.Name the parts marked A–F. Write only the answer next to the letter (A–F) inthe ANSWER BOOK.FIGURE 2Copyright reserved(6)Please turn over
(11040651)2.4-6-T1160(E)(M30)TMake a neat large sectional sketch of the four-stroke diesel engine during thepower stroke.Name ALL the parts of the engine and indicate the direction of the pistontravel by means of arrows.(8)[20]QUESTION 33.1State TWO functions of each of the following engine parts:3.1.13.1.23.1.3CrankshaftCamshaftFlywheel(3 2)3.2FIGURE 3 below shows a sketch of a single-plate clutch assembly. Name theparts marked A–G. Write only the answer next to the letter (A–G) in theANSWER BOOK.FIGURE 33.3(6)(7)Give TWO reasons for clutch slip.Copyright reserved(2)Please turn over
(11040651)-7-3.4Give TWO reasons why clutch free play is important.3.5Name THREE functions of tyres on the vehicle.T1160(E)(M30)T(2)(3)[20]QUESTION 44.14.24.3Indicate whether the following statements are TRUE or FALSE. Choose theanswer and write only 'true' or 'false' next to the question number(4.1.1–4.1.5) in the ANSWER BOOK.4.1.1Oil clearance is the small space between the moving engine partsfor the lubricating oil film.4.1.2A by-pass valve or a hose permits coolant circulation through theengine when the thermostat is open.4.1.3One of the causes of the engine overheating is the absence of afan shroud.4.1.4The slave cylinder is mounted on the clutch bell housing.4.1.5Sulphation is the formation of lead sulphate on the surface of thenegative plate.(5 1)(5)Explain the features/characteristics of the following lubricating oil SAEnumber: 20 W.(2)Name THREE oil additives.(3)Copyright reservedPlease turn over
(11040651)4.4-8-T1160(E)(M30)TFIGURE 4 below shows a sectional sketch of a radiator.FIGURE 44.4.1Name ALL the labelled parts (A–G) in the ANSWER BOOK.4.4.2State ONE function of the parts labelled A, B and C in FIGURE 4.(7)(3)[20]QUESTION 55.1State FOUR safety measures when replacing a battery in a vehicle.(4)5.2Name TWO defects on a motor vehicle that can be caused by a faulty leadacid battery.(2)5.3Name FOUR causes of sulphation.(4)5.4Name ONE function of the hydrometer.(1)Copyright reservedPlease turn over
(11040651)5.5-9-T1160(E)(M30)TFIGURE 5 below shows various tools used in the workshop. Name the toolsand write the answer next to the question number (5.5.1–5.5.9) in theANSWER BOOK.5.5.15.5.25.5.35.5.4Copyright reservedPlease turn over
5.5.55.5.65.5.75.5.85.5.9FIGURE 5Copyright reserved(9 1)(9)[20]TOTAL:100
MARKING GUIDELINENATIONAL CERTIFICATEAPRIL EXAMINATIONMOTOR TRADE THEORY N130 MARCH 2016This marking guideline consists of 6 pages.Copyright reservedPlease turn over
MARKING GUIDELINE-2MOTOR TRADE THEORY N1T1160(E)(M30)TQUESTION 1.81.1.91.1.10CBDCCCAADD1.2.1Hearing protection shall be worn1.2.2Wearing of safety helmets prohibited1.2.3Keep area clean NegligenceIgnoranceFooling aboutTirednessLack of skillsUntidy working areaUse of wrong tools or equipment Direct drive fan Indirect drive fan Electric fan(10 1)(10)(3 1)(3)(Any 5 1)(5)(Any 2 1)(2)[20]QUESTION 22.12.2 Worn-out oil rings Weak oil pump Wrongly placed oil rings(3) (3)It produces a vacuum in order to draw the fuel charge into the cylinder.It compresses the mixture in the cylinder.It traps the expanding gas at the top of the piston.It transmits energy during the power stroke to the crankshaft.It moves up and down the cylinder, and exhausts the burnt fuel charge.It conducts heat from the piston to the cooled cylinder walls.(Any 3 1)Copyright reservedPlease turn over
MARKING GUIDELINE2.32.4A.B.C.D.E.F.-3MOTOR TRADE THEORY N1T1160(E)(M30)TOuter rotorDrive shaftOutletInletInner rotorCasing(6)Just before the piston reaches top dead centre, the injector sprays diesel oilunder pressure into the cylinder which has both ports closed. The dieselignites with the hot air and the resulting explosion forces the pistondownwards.(8)[20]QUESTION 33.13.1.1Crankshaft It provides a constant turning force to the wheels. It changes reciprocating movement of piston to rotary. It distributes oil from the main journals to big end journals of theconnecting rod.3.1.2Camshaft It opens and closes the valves. It drives mechanical petrol oil pumps and distributor.Copyright reservedPlease turn over
MARKING GUIDELINE3.1.3-4MOTOR TRADE THEORY N1T1160(E)(M30)TFlywheel It smoothes out engine speed and keeps the crankshaftspinning between power strokes. It serves as a mounting surface for the clutch assembly. It helps the starter motor to crank the engine.(3 2)3.23.33.43.5(6)A.B.C.D.E.F.G.Clutch plateFlywheelRelease bearingClutch cableClutch pedalBell housingRelease lever Insufficient free playLinkage binding/stickingWeak/broken clutch plate springGrease/oil on friction surfaceIncorrectly adjusted release lever(Any 2 1)(2) Prevents slipping.Ensures that the release bearing is not in continual contact with therelease lever.(2) (7)It provides an air cushion between road and car wheels.It provides friction between tyre and the road for traction.It supports the weight of vehicle and distributes it over the road.It offers minimum rolling resistance to motion.It gives safe operating to maximum speed.It provides comfortable, quiet running of the vehicle.It absorbs road shock.(Any 3 1)(3)[20]QUESTION e(5 1)4.2 20 – oil viscosity W – winter conditionsCopyright reserved(5)(2)Please turn over
MARKING GUIDELINE4.34.4 -5MOTOR TRADE THEORY N1Viscosity indexOil bodyFluidityDetergent dispersantCorrosion inhibitionPour point depressantOxidation inhibitorFoaming inhibitorResistance to carbon formationExtreme pressure resistance4.4.14.1.2T1160(E)(M30)T(Any 3 1)A.B.C.D.E.F.G.RadiatorDrain plugOverflow bottleHose clampBottom hoseTop hoseCap Radiator – To reduce the temperature of the engine coolantDrain plug – To remove used water when servicing the vehicleOverflow bottle – To release overflow water from the radiator(3)(7)(3)[20]QUESTION 55.15.2 Wear protective clothing.Use two spanners to loosen the terminals.Remove the earth terminal first.Do not place the battery on paintwork of the vehicle.Clean the battery and the battery shelf with baking soda.Ensure that the battery shelf is dry before replacing the battery.The new battery should be clamped down properly.Connect cables to battery posts or terminals.Use two open-ended spanners to tighten clamp nuts.Check the level of the electrolyte, top up if necessary.(Any 4 1) Engine difficult to start. Engine fails to start.Copyright reserved(4)(2)Please turn over
MARKING GUIDELINE5.3 -6MOTOR TRADE THEORY N1T1160(E)(M30)TProlonged dischargingLocal chemical action in the cells, due to entry of dirt and impuritiesInsufficient or infrequent chargingThe electrolyte level being too lowThe specific gravity of the electrolyte being too low(Any 4 1)5.4To measure the density of the electrolyte in the 5.5.9Copyright reserved(4)(1)Trolley jackThe hacksawRing squeezerThe Vernier calliperCentre punchVice-grips/pipe pliersCirclip pliersEngine craneSocket spanner(9 1)(9)[20]TOTAL:100
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It helps the starter motor to crank the engine. (3 2) (6) 3.2 A. Clutch plate B. Flywheel C. Release bearing D. Clutch cable E. Clutch pedal F. Bell housing G. Release lever (7) 3.3 Insufficient free
