Mechanical Technology Automotive English

November 2019 — Grade 12 / Matric — Mechanical Technology

Past Paper 2019 Grade 12 English

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🎯 200 marks ⏱️ 3h 📄 4 pages 📝 80 items found 📚 3 topics

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Q1— Section header —

1.1The workplace is organised by ational policie s and procedures dealing with HIV/Aids. What is the purpose of this code of practice?

1.2During which ONE of the following work processes do you have to wear a helmet to prevent harmful ultra violet rays? Lathe work Angle grinding

1.3Which ONE of the following describes a workshop layout? Process layout Drill layout Inspection layout Receiving layout

1.4Which heat treatment process is used to increase the surface hardness of a steel shaft? Annealing Tempering Case hardening

1.5increase the resistance against denting increase the toughness

1.6Which ONE of the following tests can be classified as a non destructive test?

Q2— Section header —

2.3State ONE important safety rule that should be adhered to before any machine in the mechanical workshop is switched on. Give ONE reason why you need to clamp down a small work piece before any drilling is

2.6Give TWO reasons why you have to use surgical gloves when treating a co worker with open wounds. State TWO safety precautions that must be taken into consideration for the safe handling of portable electrical equipment.

2.7State ONE responsibility of an employee regarding safety in the work place. (1\ [10]10

Q3— Section header —

3.3Explain how you will prevent damage to a file when conducting a filing test on a hard metal. What is the purpose of the heat treatment of steel? Give TWO reasons for tempering hardened steel. (2\ (2\

3.4Describe how the following heat treatment processes are carried out on steel:

3.4.2Annealing Hardening (3\ (3\ [14] Mechan ical Technology: Automotive14

Q4— Section header —

4.1he purpose of conducting compression test for an internal combustion engine

4.2Which ONE of the following equipment is used to test the exhaust gases of an internal combustion engine? Torsion analyser

4.3he function of the crankshaft in an internal combustion engine is to convert the reciprocating motion of the piston into a

4.4Which ONE of the following firing order is applicable to a V6 internal

4.5An i mportant factor that determine s the thermal efficiency of an engine is the

4.6he total volume that the piston displaces hen the piston moves upwards, is referred to as the

4.7hat will be the mechanical efficiency of an engine f the brake power of the engine is 6

4.8Which ONE of the following safety procedures must be adhered to when a cylinder leakage tester is used on an internal combustion engine

4.9Which ONE of the following is the cause of low oil pressure in an internal combustion engine?

4.10Which ONE of the following statements defines the caster angle on motor vehicle

4.11Which ONE of the following term describes the condition when the impeller of a torque converter rotates at maximum speed and the turbine is

4.12Which gear is the outside gear in a epicyclical ( planetary

4.13What does the abbreviation MAP stand for in terms of the air induction sensor

4.14Which ONE of the following is the purpose of the brake bands in the three speed automatic gearbox?

Q5— Section header —

5.1FIGURE 5. below shows cylinder leakage tester. Answer the questions that follow. FIGURE 5.

5.1.1 Label (4\ 5. .2

5.3Name TWO gases that the exhaust gas analyser analyses. (2\

5.4What is the purpose of the turn tables with reference to the wheel alignment equipment (2

5.5State THREE outcomes of dynamic wheel balancing. (3 23 Mechan ical Technology: Automotive

Q6— Section header —

6.1State TWO main causes of crankshaft vibration in an internal combustion engine (2\

6.2FIGURE 6. below shows a component that is fitted to the front of the crankshaft in an internal combustion engine . A nswer the questions that

6.2.1 Identify t he component shown in FIGURE 6.2 (1\

6.2.2 Label of the component above. (6\ 6.

6.3State TWO factors which determine the firing order of an internal combustion engine. (2\

6.4At what angle are the crankpins of a V8 cylinder engine situated (1

6.5Why is an intercooler fitted to a turbo charged diesel engine

6.6What is the purpose of supercharger on an internal combustion engine (2

6.7FIGURE 6.7 below shows a type of supercharger /blower . Answer the questions that follow FIGURE 6.7

6.7.1 Identify the type of supercharger/blower in FIGURE 6.7 above (1\

6.7.2 Label of the supercharger/blower above. (5

6.7Explain the operation of the supercharger/blower above (5 [28]28

Q7— Section header —

7.1Define swept volume in an internal combustion engine (2\

7.2State THREE methods that can be used to increase the compression ratio of an internal combustion engine

7.4The following data refers to a four stroke four cylinder petrol engine Engine speed during the test

7.4.2Brake ower in kW (4\

7.4.3Mechanical fficiency of the engine (2\

7.5Define echanical fficiency of an internal combustion engine

7.6Define rake ower of an internal combustion engine

Q8— Section header —

8.3State T WO manufacturers specifications that could be used to conduct cooling system pressure test.

8.5.1to

8.5.6\the ANSWER BOOK FAULTS (DEFECTS\ POSSIBLE CAUSES CORRECTIVE MEASURES High carbon monoxide (CO\ding

8.5.2Low carbon dioxide (CO \eading.

8.5.4High hydrocarbon (HC\ reading

8.5.6(6\ TAB LE 8.

8.6State T WO manufacturers specifications that could be used to conduct fuel pressure test

Q9— Section header —

9.1State ONE purpose of an automatic gearbox in a motor vehicle (2\

9.2State TWO advantages of a vehicle fitted with an automatic gearbox (2\

9.3State TWO disadvantages of a vehicle fitted with an automatic gearbox (2\

9.4FIGURE 9.4 below shows the operation of a torque converter nswer the questions that follow

Q10— Section header —

10.1State ONE cause of the following tyre wear:

10.1.1Feather ing (1\

10.1.2One side of the thread worn excessively (1\ 10. State TWO requirements of a well designed steering mechanism.

10.3below shows the ing pin inclination on the suspen ion of a

10.7What is the purpose of the catalytic converter fitted to the exhaust system of a motor vehicle (2\

0.8State THREE main aims of the adaptive speed control system. (3\

10.9What is the function of the slip ring and brush assembly on an alternator (2\

10.1Draw the symbol of a diode that shows the direction of current flow. (2\

10.1State TWO advantages of an electric al fuel pump on the fuel system of an internal combustion engine

Topics Identified

CircuitsMachinesConstruction

Mark Allocation

Total200 marks

Sections6 + 10 + 14 + 28 + 32 + 18 = 108 marks

Paper information

SubjectMechanical Technology

Year2019

SessionNovember

TypePast Paper

PaperSee title

LanguageEnglish

Pages16

Downloads12

Examination context

Decade2010s

Years ago7y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2019

Days since exam2,544

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