Mechanical Technology Fitting & Machining (Eng) P1

May-June 2019 — Grade 12 / Matric — Mechanical Technology

Past Paper 2019 Grade 12 English

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🎯 200 marks ⏱️ 3h 📄 3 pages 📝 112 items found 📚 4 topics

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112

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Q1— Section header —

1.1Which Act is the code of good practice with regard to HIV/Aids and employment at the workplace? The Act on safety states that all employe

1.2Which ONE of the following is a reason why oil and grease must NOT be allowed to come into contact with oxygen and acetylene fittings? cause blockages

1.3Which ONE of the following is an advantage of the process workshop layout?

1.4Which ONE of the following factors is important in the heat treatment of steel?

1.5What is the purpose of annealing steel? Harden it Temper it

1.6Which ONE of the following sounds will indicate cast iron when a sound test is carried out?

Q2— Section header —

2.1A welded joint needs to be ground using an angle grinder. State TWO safety measures to be observed whe using the angle grinder. (2\

2.2Give TWO reasons why it is important to wear welding goggles during gas welding. (2\

2.3Name TWO items of personal protective equipment (PPE\that one will use when working with a bench grinder (2\

2.4Explain the difference between the process workshop layout and the product workshop layout (2\

2.5Describe the employer responsibility regarding equipment in the workplace. (2\ [10]10

Q3— Section header —

3.1Name and describe the FOUR tests used to distinguish between the different types of materials. (8\

3.2Give the reason why the following heat treatment processes are performed on steel

3.2.1Tempering (2\

3.2.2Normalising (2\

3.2.3ardening (2\ [14] Mechanical Technology: Automotive DBE/201914

Q4— Section header —

4.1Which ONE of the following safety procedures relates to the cylinder leakage tester? Use water to remove dust around the spark

4.2Which ONE of the following tests indicates the condition of an engine s piston rings?

4.3The upercharger is the most efficient and common of all forced induction systems.

4.4What do you understand by the term oost with regard to turbochargers? The pressure accumulated by the turbocharger in the inlet manifold

4.5What is the unit for turning moment? N/m N.m N.m

4.6Which ONE of the following method s is used to raise the compression ratio of an internal combustion engine? Adjust the valve timing on the belt.

4.7Which ONE of the following safety measures must be considered while setting up the oil pressure tester? the tester fits tightly to give an accurate reading

4.8hat will be the mechanical efficiency of an engine f the brake power of the engine is 66 kW and the indicated power is 75 kW?

4.9What will be the gear ratio of a gear system if the driver gear has 25 teeth and the driven gear 100?

4.10The system is used to obtain different gear ratio between the driv er and driven gear members in an automatic transmission.

4.11What do you understand by the term torsional vibration in relation to crankshaft balancing? Rotational movement

4.12Which ONE of the following statements describes the function of the capacitor in the alternating current charging system? limits the voltage developed through the magnetic field that produces an electro magnet.

4.13Which ONE of the following methods is used to increase the output frequency of the alternator? Increase the number of

4.14What does it mean if a fuel pump is referred to as a wet pump that the pump feeds the fuel from the fuel tank at predetermined

Q5— Section header —

5.1Nelson conducted a compression test on a four cylinder petrol engine and found that the engine has low compression in one of the cylinders.

5.1.1Name TWO types of compressio n tests Nelson can perform on the engine. (2\

5.1.2Give TWO possible reasons for low compression in the cylinder. (2\

5.2Explain how static imbalance of a wheel is correct ed using a wheel balancing machine. (2\

5.3FIGURE 5.3 below shows a cylinder leakage tester. Answer the questions that follow FIGURE 5.3

5.3.1Label components (5\

5.3.2Give TWO reasons why it is necessary to perform a cylinder leakage test on an engine. (2\ Mechanical Technology: Automotive

5.4The gas analyser is used to determine the carbon monoxide (CO\and carbon dioxide (CO readings of the exhaust gases of an internal combustion engine. Give TWO reasons for a high CO reading. (2\

5.5Study the wheel alignment equipment shown below in FIGURE 5.5 and answer the questions that follow FIGURE 5.5

5.5.1Identify the wheel alignment equipment shown in FIGURE 5.5. (1\

5.5.2Explain how to take a caster reading on the wheels of a motor vehicle using the wheel alignment equipment in FIGURE 5.5. (5\

5.6Which information is required by the diagnostic scanner before a diagnostic test can be conducted on an internal combustion engine? (2\

Q6— Section header —

6.1Proper balancing of all moving engine parts is essential high engine speed. Answer the questions that follow

6.1.1State TWO methods to balance the engine crankshaft. (2\

6.1.2Briefly explain how the balancing is done using EACH of the methods

Q6— Section header —

6.1.3State TWO factors that cause vibration in an internal combustion engine. (2\

6.2State TWO factors that will determine the firing order in an internal combustion engine. (2\

6.3Explain the function of a vibration damper in an internal combustion engine. (2\ Mechanical Technology: Automotive DBE/2019 /NS

6.4The performance of smaller engines can be improved by using superchargers as shown in FIGURE 6.4 below . Answer the questions that follow

6.4.1Identify the type of supercharger shown in FIGURE

6.4(1\

6.4.2Label parts of the supercharger above (4\

6.5State TWO advantages of a motor vehicle fitted with a supercharger. (2\

6.6Explain how a turbocharger on an internal combustion engine operates. (7\

6.7State TWO disadvantages of turbocharger when compared with superchargers. (2\

6.8Explain the effect of high altitude on the performance of an internal combustion engine. (2\ [28]28

Q7— Section header —

7.1Define the term compression ratio of an engine. (2\

7.2The bore and stroke of an engine is 84 mm and 90 mm respectively and they ha ve a compression ratio of 8,5 1. Calculate:

7.2.1The swept volume (3\

7.2.2The original clearance volume in cm (3\

7.2.3The compression ratio is increased to 9,5 1. What would be the new bore diameter if the clearance volume remains unchanged?

7.3

7.3.1Torque (3\

7.3.2Indicated power (9\

7.3.3Brake power (3\

7.3.4Mechanical efficiency (3\ [32]32

Q8— Section header —

8.1State THREE m anufacturers specification s that could be used to conduct an oil pressure test (3\

8.2Give TWO reasons why an exhaust pressure test is conducted (2\

8.3Explain how a pressure test is conducted on a radiator cap (4\

8.4List FOUR manufacturer s specifications that must be obtained before a fuel pressure test can be carried out. (4\

8.5Due to engine power loss in a vehicle the mechanic/technician conducts a compression test according to certain procedures. Explain why the following procedures are conducted

8.5.1Remove the high tension lead (2\

8.5.2Unplug the fuel injection system (2\

8.5.3Open the throttle valve fully (2\

8.5.4Record the readings (2\

8.6Explain how a wet compression test is conducted on an internal combustion engine after a dry compression test has been done on the engine. (2\ [23] Mechanical Technology: Automotive 1123

Q9— Section header —

9.1Name TWO methods used to cool the oil in the automatic transmission of a motor vehicle

9.2State TWO advantages of an automatic gearbox when compared with manual gearbox. (2\

9.3What is the main purpose of an automatic transmission gearbox when compared with a manual gearbox?

9.4Explain the influence of the gear ratio on the torque of a motor vehicle.

9.5State TWO advantages of the torque converter in the automatic transmission of a motor vehicle (2\

9.6FIGURE 9.6 below shows a component of an automatic gearbox. Answer the questions that follow FIGURE 9.6

9.6.1Identify the component shown in FIGURE 9.6. (1\

9.6.2Label parts (6\

9.6.3State the function of the component in FIGURE 9.6. (1\ [18]18

Q10— Section header —

10.1State FIVE factors to be taken into account before attempting a wheel alignment adjustment or check. (5\

10.2Explain the purpose of toe out on turns. (2\

10.3Define dynamic balance of a tyre and wheel assembly. (1\

10.4Give TWO reasons why a motor vehicle is equipped with a speed control system. (2\

10.5State TWO disadvantages of the speed control system. (2\

10.6What is the purpose of a diode in an alternator? (2\

10.7State TWO advantages of an electric fuel pump. (2\

10.8State TWO criteria that a fuel injector needs to comply with. (2\

10.9FIGURE 10.9 below shows a wheel alignment angle. Answer the questions that follow on the next page

10.9.1Identify the wheel alignment angle shown in FIGURE 10.9 (1\

10.9.2Label in FIGURE 10.9 (6\

10.9.3Define the alignment angle as shown in FIGURE 10.9. (2\

10.10FIGURE 10.10 below shows a component of an alternator. Answer the questions that follow FIGURE 10.10

10.10.1Identify the component shown in FIGURE 10.10 (1\

10.10.2Label in FIGURE 10.10. (3\

10.10.3State the function of the component in FIGURE 10.10 (1\ [32] TOTAL: 200 Mechanical Technology: Automotive DBE/201932

Topics Identified

CircuitsMachinesMaterialsConstruction

Mark Allocation

Total200 marks

Sections6 + 10 + 14 + 14 + 28 + 32 + 23 + 18 + 32 = 177 marks

Paper information

SubjectMechanical Technology

Year2019

SessionMay-June

TypePast Paper

PaperSee title

LanguageEnglish

Pages14

Downloads12

Examination context

Decade2010s

Years ago7y

Season—

Start day—

Exam period—

Days since exam—

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