Mechanical Technology Memo 1 (English)

Feb-March 2011 — Grade 12 / Matric — Mechanical Technology

Memo 2011 Grade 12 English

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🎯 200 marks 📄 15 pages 📝 76 items found ∑ 1 math symbols 📚 4 topics 🔑 1 key info

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1.20

Q1— Section header —

Q2— Section header —

2.1(1) MPa 41,84 10 0,55

2.1.1Compression Stress

2.1.2Stress in material MPa41,84100,551023AFm100,554\0,03(0,044\d(DA 33232222 (5\ 2.1.3 Shortening of bush

2.2Pa 176348,967 or MPa 0,18

1.13200 10 1,13 0,038

2.2.1Fluid pressure Pa4176348,967orMPa0,18101.13200AFpm101,1340,0384DA3pp232p2p (3\ 2.2.2 Diameter of ram

2.3Gear Drive r/min 480 600 288000 20

2.4Belt Drive mm 1355,5 220 420 710

2.3.1Rotation of motor r/min4806002880002030904080NE (2\ 2.3.2 Advantages No slip occurs It is much stronger More accurate Last longer (Any TWO correct answers\

2.4.1Diameter of driven pulley

2.4.2Width of belt

2.5Gear Teeth = Module x Num ber of teeth

2.6= Leading angle =Clearance angle,

2.7Clutches mm 280 0,28

2.5.1Pitch circle diameter = 4 x 60

2.5.2Addendum = Module

2.5.3Clearance = 0,25 x module or 0,157 x module

2.5.4Dedendum = 1,25 x

2.5.5Outside diameter = PCD + 2 module = 248 mm Square thread cutting tool = Trailing/Following angle, = Helix angle

2.7Friction clutch

3.1Brinell hardness tester

3.2Tensile test To determine, the yield stress, the ultimate tensile stress, the percentage elongation of a piece of material.

3.3Wet compression test and the wet test for performing the cylinder leakage test

3.5Torsion moments along the longitudinal axis of a member.

Q3— Section header —

3.4.1Gas analyzer (2\

3.4.2Carbon Monoxide (CO\CO Torsion is the twisting action in a member caused by two opposing

3.6Is to investigate the deflection of the beam to see if the beam will

4.1Tin snips (1) (2) (1)1

4.2They are alloys that contain iron examples

4.3Hammer head (1) (2)2

4.4Tensile definition The ability of a material to withst and pulling forces or tension forces

4.5Tensile strength (2)2

Q4— Section header —

4.1.1High carbon steel or Tool steel

4.1.2They resist wear It has high tensile strength

4.1.3To prevent rust Ferrous alloys Low, medium and high carbon steels, stainless steel, chromium steel manganese steel vanadium steel titanium tungsten steel

4.3.1Medium carbon steel

4.3.2Very tough High tensile strength Material B has the lowest tensile strength because it deforms easily under tension or is the most deformed material.

4.6Electric plug (2) (2)2

4.7Properties of Carbon Fibre

4.6.1Nylon It has resistance to wear It is a good insulator It has low frictional properties. (Any TWO correct answers\

4.6.2Bronze Strong Tough Corrosion resistance Good conductor of electricity (Any TWO correct answers\ Stiff and strong Low density Light weight Resistant to corrosion

Q5— Section header —

5.1Torsion tester ming off after the metal fractures. (4)4

5.2protective equipment galvanized or zinc coated mate rial

5.3Helical cutter (Any FOUR correct answers)

5.4

5.5Indexing Hole circles Side 1 24 25 28

5.5.1246or2876641or774116040n40Indexing 7 holes on a 28-hole circle or 6 holes on a 24-hole circle

5.5.3The index plate rotates in ion to the crank 12

5.6Cutting speed mm/min 636.62 318.31 20 0,1

5.7Dividing head

5.8rayed onto the clean surface. e to penetrate the welded joint. w it to dry thoroughly. dye penetrant, that has penetrated the cracks or pin holes. are flaws in the joint.

5.9Incomplete penetration Causes: (Any THREE correct answers) Cures/Prevention (Any THREE correct answers)

Q6— Section header —

6.1Lubricating oil

6.2SE - The letter 'S' Spark Ignition Engines (1) (1)1

6.3Cutting fluid and fusing to the cutter teeth. nish of machined surface. FOUR correct answers)

6.1.1

6.1.2Needs of lubricating oil Viscosity must be correct. It must resist oxidation. It must prevent rust. It must avoid foaming. Resist carbon forming. It must prevent corrosion. It must resist extreme pressures (Any FOUR correct answers\

6.1.3Reasons for oil change Formation if gum, acids and lacquer may be left by the combustion of the fuel. Loses its viscosity after a while due to heat. Metal particles due to metal and metal contact Oils

6.2.2CE - The letter 'C' Compression Ignition Engine

6.2.3SAE 20W50 - Society of Automotive Engineers. Multi grade oil

6.2.4Carry away the heat generated by machining process. Acts as a lubricant. Prevents the chips from sticking Improve quality of the fi To obtain a higher cutting speed. It gives the cutting tool a longer lifespan.

6.4Properties of grease ant, it must not mix

6.5Purpose: pressure that is higher than atmospheric pressure. the engine is increased.

6.6therefore there is no power loss.

6.7Steam turbines (Any THREE correct answers)

6.5.1The supercharger fills the cylinder with an increased The compression pressure in the cylinder is increased. The volumetric efficiency of (Any TWO correct answers\

6.5.2Examples: Used in racing cars. Four-stroke Compression Ignition engines in heavy Earth moving equipment Aircraft engine to overcome loss of power owing to height above sea level. (A ny THREE correct answers\

6.5.3More power is obtained compared to a similar vehicle Supercharged engines are more economical per given Less fuel is used compared to engine mass. Power loss is eliminated above sea level (Any THREE correct answers\

6.8Gas turbines he given weight of engine almost eliminated. (Any THREE correct answers)

Mathematical Content

f(x)

Topics Identified

CircuitsMachinesMaterialsConstruction

Mark Allocation

Total200 marks

Sections20 + 50 + 20 + 20 + 50 + 40 = 200 marks

Per-question sum180 marks

Key Information

Contact Number0600288000

Paper information

SubjectMechanical Technology

Year2011

SessionFeb-March

TypeMemo

PaperPaper 1

LanguageEnglish

Pages15

Downloads2

Examination context

Decade2010s

Years ago15y

Season—

Start day—

Exam period—

Days since exam—

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