Mechanical Technology Paper 1 (Afrikaans)

Feb-March 2012 — Grade 12 / Matric — Mechanical Technology

Past Paper 2012 Grade 12 Afrikaans

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🎯 200 marks 📄 15 pages 📝 77 items found 📚 2 topics 🔑 1 key info

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Q1— Section header —

1.6C D

1.14C D

1.20

Q1— Section header —

1.1A B

1.2A B C

1.3A B A B C D

1.5A B C B C D

1.7A B A B C D A B C D B C D A B C D

1.12A B C A B C D B C D

1.15A B C

1.16A B B C D A B C D A B C D B C D [20]20

2.1exhaust valve is leaking Listen for a hissing noise in the dipstick hole piston ring is worn rings are worn

2.2GAS ANALYSER: Rich mixture setting Incorrect idle speed e (jammed in the closed position)

2.3.2and percentage elongation of a piece of metal. deflection of beams. (2)2

2.4HARDNESS TESTERS: Brinnel hardness tester Rockwell hardness tester (1)1

2.5MULTIMETER: DC current measurement DC voltage measurement AC voltage measurement Resistance measurement

2.6

Q2— Section header —

2.3.1A tensile test is to measure the yi eld stress, ultimate tensile stress The purpose of the beam bending test is to investigate the Any 3 x 1

3.1FERROUS ALLOYS: Carbon and iron (2)2

3.2.2Material B has the highest torsional strength (1) (2)2

3.3.2alloy Brass /Yellow copper Bronze Phosphor bronze

3.4MATERIALS FOR TAP:

3.4.3Brass Brass or bronze Brass/Plastic/Pers pex/Nylon/Pewter

Q3— Section header —

3.2.1Reason: Material B has twisted t he least which means that it has more ability to withstand twisting forces, or torsion. NON-FERROUS ALLOYS:

3.3.1A non-ferrous alloy is a metal that has a combination of two or more non-ferrous metals, which ar e melted together to form one Examples of non-ferrous alloys: Solder Any 3 x 1

3.4.4Corrosion resistant Malleable Easily machineable Can be easily moulded into shapes Any 4 x 1

3.4.5To provide a water tight seal when closed. (2\

Q4— Section header —

4.1Overarm

4.3CUTTING FEED: mm/min 06 255

4.4.3Direct/Rapid indexing Differential indexing Simple indexing (1)1

4.5.4Dovetail cutter (1)1

4.2By adding another helical cu (2\ mm/min06,255184,272461,0r/min8370453,27214,01201ffNTffNNDVNDNV (6\ 4.4 INDEXING METHODS:

4.4.1MILLING CUTTERS:

4.5.1Cylindrical/helical(slab\ Single-angle milling cutter Concave-milling cutter

4.6GEARS: Module of small gear: mm 25 39

4.6.1mm25,23975,87ulemodmTPCDm (2\ 4.6.2

4.6.6Indexing on the large gear:

4.7Dye-penetrant test X-ray test Ultrasonic test (3)3

4.8WELD DEFECTS: Insufficient penetration: Speed too fast Joint designed faulty Electrode too large

4.9anvil. Use the specified load when testing. The load must not cause any marking on

4.10Make sure that the legs of the puller are not worn or bended Make sure that the legs are well secured when pulling. Use split covers to prevent injuries. cause injuries.

4.8.1Any 2 x 1

4.8.2Porosity: Any 2 x 1

4.8.3Improper welding technique Any 2 x 1 (2\ BRINELL HARDNESS TESTER: Care to be taken that the test load is not applied when the anv il is within the travel range of the ram and Brinell ball, unless the test piece is placed on

Q5— Section header —

5.1FITTING A NEW OIL FILTER: Drain the oil at oper ating temperature Use a filter strap spanner and remove old filter. Clean the filter area.

5.2Formation of gums, acids and lac quer due to fuel combustion. Loses its viscosity after a while due to heat. Metal particles due to metal to metal friction are absorbed in the oil. (3)3

5.3It is dyed red (colour) Oil is thin (viscosity) (2)2

5.4BEARINGS: earing can be subjected to: Radial load. Thrust load.

5.5TURBOCHARGERS:

5.4.1Three types of loads that a b Combined radial and thrust load. (3\

5.4.2Poor lubrication. Bearing not torque according to specification. Load on bearing excessive. Poor assembly of bearing shells, not seating properly. Any 3 x 1

5.4.3Reasons for grease lubricati on of a wheel bearing: (4\

5.5.1Operation of turbocharger: exhaust system.

5.6ADVANTAGES OF GAS TURBINE AS USED IN A JET ENGINE: ven weight of engine. The high torque output simplif ies the transmission system. Smooth running with less vibration due to absence of reciprocating parts.

5.7SUPERCHARGERS: Gear driven Belt driven (2) [40]40

5.5.2The exhaust gases from the engine move through the turbine at a very high speed to drive the turbine. The gases go through the turbo-assembly into the normal As the turbine wheel spins, it turns a common shaft, which

5.5.3Oil cooler: (2\ High power output from a gi No rubbing parts such as piston so that internal friction and wear are almost Low lubricating oil consumption. Non-poisonous exhaust gases giving very little trouble with pollution.

6.1HYDRAULICS: Force on piston A: 30 246

Q6— Section header —

6.1.1N30,246\0006151752,0(\104,0(m1015752,6m0006151752,04\028,0(4624222AAAAAAPFAFPDA (5\ 6.1.2

6.2STRESS AND STRAIN: Diameter of bar: mm 97 24

6.2.1mm97,24m024972535,010489795,0444m10489795,0105,241012322363ADDAAF (6\ 6.2.2

6.3BELT DRIVE:

6.3.1r/min 78 738 230 440 118 DN

6.3.2Belt speed: ms 90 60

6.3.3kW 60 watts 602

6.4DIFFERENTIAL WHEEL AND AXLE:

6.4.280 560 120 200

6.4.3Mechanical efficiency: 14 57 100

6.5.1Nm 283 09

6.5.2kW 133 60 283

Topics Identified

CircuitsMaterials

Mark Allocation

Total200 marks

Sections20 + 20 + 20 + 20 + 50 + 40 + 50 + 50 = 270 marks

Per-question sum175 marks

Key Information

Contact Number0006151752 · 0 000272222

Paper information

SubjectMechanical Technology

Year2012

SessionFeb-March

TypePast Paper

PaperPaper 1

LanguageAfrikaans

Pages15

Downloads5

Examination context

Decade2010s

Years ago14y

Season—

Start day—

Exam period—

Days since exam—

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