Mechanical Technology Fitting and Machining Paper 1 (English)

November 2021 — Grade 12 / Matric — Mechanical Technology

Past Paper 2021 Grade 12 English

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🎯 200 marks ⏱️ 3h 📄 17 pages 📝 93 items found 📚 4 topics

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Q1— Section header —

1.6\your ANSWER BOOK , e.g. 1.7

1.1What is the code of good practice for HIV/ Aids and employment?

1.2Which ONE of the following types of personal protective equipment (PPE\ is required when working in a workshop with Covid

1.3is responsible for the provision of safety gear in the workshop. employee clea

1.4Which ONE of the following describes the reaction of mild steel when it is cut on a machine Cuts easily;

1.5resist wear. elieve strain

1.6Which process follow s on from hardening? Normalising Annealing

Q2— Section header —

2.1Explain TWO first aid measures to consider when treating an open wound. (2\

2.2State TWO safety precautions that must be adhered to after the surface grinder has been switched on. (2\

2.3Give ONE reason why the pressure gauge of a hydraulic press must be calibrated frequently. (1\

2.4Which TWO hazards are prevented by the finger protectors fitted to power driven guillotines? (2\

2.5State TWO safety measures to be considered before gas welding or flame cutting operation can be performed. (2\

2.6Wh ich type of workshop layout is shown in FIGURE 2. 6 below Product 1 Machine A Machine B

Q3— Section header —

3.1Describe the filing process as easy or difficult when conducting a file test for hardness on the following materials:

3.1.2Mild steel

3.1.3High speed steel

3.2FIGURE 3. below shows the annealing process during heat treatment. Label components

3.3Describe how a bending test is conducted to determine the properties in a test metal. (3\

3.4State the purpose of case hardening of steel. (2\

3.5Name T HREE types of quenching media that could be used to harden steel

Q4— Section header —

4.14the ANSWER BOOK , e.g. 4.15

4.1Which type of balancing is performed at high speeds? Normal balancing Static balancing Dynamic balancing Vibrational balancing

4.2What is th e function of the turn table while performing wheel alignment checks

4.3The camshaft rotation for the i gnition of the air and fuel mixture in a four stroke

4.4Which forced induction system has the most lag? Non variable type turbocharger Variable geometry turbocharger

4.5The compression ratio (CR\ of an engine is the relationship between the total volume of the engine and the volume of one

4.6

4.7dynamometer measure theoretical power developed by the engine. brake power of the engine.

4.8Which of the following is the cause of high levels of hydrocarbon (HC\ in the exhaust gases of an internal combustion engine

4.9What will cause a high oil pressure reading in an internal combustion engine

4.10Which component in an automatic gearbox directs the oil pressure to select the required gear ratio? Brake bands Torque converter

4.11How is the lock up clutch activated in a torque converter? By oil pressure Using the

4.12What is the cause of the tyre wear indicated in FIGURE 4.12 below FIGURE 4.12

4.13Wheel alignment is performed on a motor vehicle to wheel spin when racing. over

4.14he function of a sensor in an engine management system activate an engine system.

5.1The steps to conduct a compression test on an internal combustion engine are listed below Complete STEPS 5 to 8

5.1.1to 5.1.4 as shown. STEP 1 Ensure the engine is at operating temperature. STEP 2 Disconnect the fuel supply and ignition system STEP 3 Clean the area around

5.1.1(1\ STEP 6

5.1(1\ STEP 7

5.1.3(1\ STEP 8

5.1.4(1\

5.2Answer the question related to the cylinder leakage tester shown in FIGURE 5. below

5.4Describe the set up procedure of an on board d iagnostics (OBD\ scanner to check for faults

5.7State THREE precautions to be taken before the optical wheel alignment equipment is fitted to the wheel (3\ 23

Q6— Section header —

6.1With reference to the crankshaft, give THREE reasons for using the correct firing order o n an internal combustion engine.

6.2State TWO ways in which dynamic imbalance of the crankshaft can be corrected. (2\ 6.

6.5above (3\ 6. .2 Describe the operation of the

6.6What is the function of the following components on an internal combustion engine equipped with a variable geometry turbocharger?

6.6.1Intercooler (2\

6.6.2Vanes (2\ 6. State THREE advantages of a supercharger when compared to a

Q7— Section header —

7.1Define the following terms regarding an internal combustion engine:

7.1.1Brake power (2\

7.1.2Torque (2\

7.2The indicat ed power diagram represents the power stroke and compression stroke. How do the compression stroke and power stroke

7.3FIGURE 7.3 below shows a cylinder with the piston at TDC and the same cylinder with the piston at BDC. The

7.3.1Wh ich term is used to describe the volume (1\

7.3Which term is used to describe the volume (1\

7.3Calculate the total cylinder volume in cm (3\

7.3Ca lculate the bore diameter in mm.

7.3Calculate the ompression ratio of this cylinder.

7.4State TWO methods to lower the compression ratio in an internal combustion engine. (2\ 7. The follow ing data refers to a two

Q8— Section header —

8.1nswer the following questions ith ref erence to an exhaust gas analysi s.

8.1.1State TWO causes of a low CO exhaust gas reading. (2\

8.1.2State TWO corrective measures for the causes stat ed in QUESTION

8.1(2\

8.2State TWO exhaust gas readings as detected by a gas analyser, which are caused by

Q9— Section header —

9.1FIGU .1 below ho

9.1.1Label parts in FIGURE 9.1 above (5

9.1State THREE functions of a torque converter.

9.1When is maximum torque multiplicati on obtained in a torque converte r? (2\

9.2Explain how forward overdrive is obtained in an epicyclic gear train. (3\

9.3What do the following gearshift lever positions on an automatic transmission refer to?

9.3(1\

9.4In which TWO gearshift lever positions, P, R, N, D, 1 or is it possible to start the engine fitted with an automatic transmission?

Q10— Section header —

10.1Give THREE reasons why wheel alignment must be done on a vehicle. (3\

10.2FIGURE 10.2 below shows camber wear on a tyre. Answer the questions that follow FIGURE 10.2

10.2.1State FOUR causes of excessive camber wear. (4

10.2.2Define positive camber angle (2\

10.2.3How is camber adjusted on suspension? (2\ 10 .3 Draw a neat, labelled sketch to show oe

10.4State TWO negative effects caused by dynamic imbalances wheel

10.8below shows a component of an alternator. nswer the questions that follow. FIGURE 10.8

10.8.1Identify the component in FIGURE 10.8 above (1\

10.8.2What is the function of the component shown in FIGURE 10.8 above (2\

10.8.3Draw TWO labelled sketches to show the two types of windings for the component in FIGURE 10.8

Topics Identified

CircuitsMachinesMaterialsConstruction

Mark Allocation

Total200 marks

Sections6 + 10 + 14 + 28 + 32 + 23 + 18 + 32 = 163 marks

Paper information

SubjectMechanical Technology

Year2021

SessionNovember

TypePast Paper

PaperPaper 1

LanguageEnglish

Pages19

Downloads9

Examination context

Decade2020s

Years ago5y

SeasonSpring (SH)

Start dayFriday

Exam periodNovember 2021

Days since exam1,815

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