Mechanical Technology Memo 1 (English)

November 2016 — Grade 12 / Matric — Mechanical Technology

Memo 2016 Grade 12 English

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🎯 200 marks 📄 20 pages 📝 101 items found ∑ 2 math symbols 📚 3 topics

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101

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Q1— Section header —

1.1(1\

1.2(1\

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1.20(1\ [20]20

Q2— Section header —

2.1Surface Grinder Do not force the work piece into the wheel. Do not clean the machine while it is in motion. Avoid large cuts. Use coolant.

2.2Arc welding Welding helmet Gloves Overall pron oots protection Ear protection Vaporising mask.

2.3Bearing p uller Make sure that the legs of the puller are not worn Make certain that the legs are well secured. Use split cover. o not work directly behind the puller.

2.4

2.5Rockwel l tester The area around the tester should be cordoned off. Only one person in side the confined space. rotective clothing. afety goggles.

Q3— Section header —

3.1Beam Bending Test To investigate the deflection of beams. To see if t he beam is capable to support the load. To see if the beam is s trong enough (2\

3.2CO reading ( Gas Analyser Rich mixture setting Incorrect idle speed Clogged air filter Faulty choke creating a rich mixture (jammed in the closed position Incorrect ignition timing. Faulty injectors

3.3Advantages GS welding Can weld in any position. Less skilled operator required. (continuous\ welds can be made without stops and starts. Minimum post

3.4Multimeter To test voltage current AC current AC voltage Resistance Transistor

3.5Compression tester:

3.5High tension lead The i gnition system will be disabled To be able to r emove spark plug Prevent electrical shock To protect the ECU Reduce fire hazard

3.5Fuel injectors disconnected To prevent unburned fuel entering the exhaust system To prevent fuel enter ing the tester. (1\

3.5.3Throttle valve fully open To obtain the correct amount of air entering the cylinder obtain a correct reading. (1\

3.5.4Recording the readings To compare the readings to the specification. To note the differences in readings between the cylinders. (1\ [12]12

Q4— Section header —

4.1Characteristics of c ementite ard Brittle (2\

4.2Case hardening on camshaft To ensure hardness to the surface To ensure resistance against wear ensur a soft and tough

4.3Tempering hardened steel To reduce brittleness o increase tough ness (2\

4.4Iron carbon equilibrium diagram (7\ [13] 1000 900 800 720 0,4 0,613

Q5— Section header —

5.1Gear alculation

5.1.1PCD Module (2\

5.1.2m(T

5.1.3PCD

5.1.4Dedendum

5.1.5PCD PCD

5.1.6Indexing Indexing: = one full turn of the crank and 1 holes in a hole p late (3\

5.2Key calculations

5.2.1Diameter of key Width (2\

5.2.2Diameter Length of (2\

5.2.3Diameter of key Thickness (2\

5.3Milling Machine components

5.3.1Functions of the index plate A plate with holes to able to subdivide 1 turn of the crank into fractions of a turn.

5.3.2Function of the s ector arm sed to ease the setting of the required number of holes Do not have to recount the number of holes needed.

5.4External V screw thread Compound slide method Cross slide method (2\ [30]30

Q6— Section header —

6.1Causes of welding defects

6.1.1Undercutting Improper settings of equipment Welding speed to fast Current high Current too low Arc length to long Incorrect electrode size

6.1.2Lack of fusion Weld speed too fast Welding current too low Weld joint very wide Incorrect electrode size

6.2Ultrasonic test A high frequency sound wav is send into the metal The same unit which used to send the sound wave is then used to

6.3Ultrasonic ray testing It can measure the depth of the defect No additional material and equipment needed. No isolation needed. Safer than x ray. It is cheaper.

6.4y test on welded joint hotographic film /paper/plate onitor /TV/screen/computer

6.5Dye penetrant test To detect surface / external flaw s on a welded joint (2\

6.6Destructive tests Nick break test end test or Free bend test or Nick bend test Machinability test Tensile test (2\

6.7MIG/MAGS shielding gases Argon Helium Teral (2\ MIG /MAGS welding Molten w eld pool

Q7— Section header —

7.1Resultant cos cos sin sin Horizontal component Magnitude Vertical

7.2Stress and Strain

7.2.1Diameter of shaft 05046 (5\

7.2.2Strain (3\

7.2.3Change in length (3\ 14

7.3Moments Calculate A Moments about B LHM RHM 5100 2400 3300 Calculate B:

Q8— Section header —

8.1Effects routine maintenance Risk of injury or even death. Financial loss due to damage Decrease the lifespan of equipment. of valuable production time. (3\

8.2Preventive maintenance Planned/scheduled maintenance Condition based maintenance

8.3Properties of oil Pour point Lowest temperature at which a liquid remains pourable Flashpoint owest temperature at which the oil gives off vapour w hich

8.6Chain drive maintenance By doing the following regularly: Set the tension Correct alignment Check for wear and tear

Q9— Section header —

9.1Belt Drives

9.1.1Rotation frequency of the driver pulley min r.s 2989 (4\

9.1.2Power transmitted Watt or 7560 (4\

9.2Gear drives

9.2Rotation frequency of the output shaft 1380 INPUT OUTPUT INPUT OUTPUT INPUT (3\

9.2Velocity Ratio OUTPUT INPUT (2\

9.3Hydraulics

9.3.1Fluid pressure kPa 218844 2566 (4\

9.3.2Load on piston B in kg Mass (4\ 18

9.4Traction control Traction control system prevent the wheels from spinning. (2\

9.5Air bags river and passengers do not need to activate the air bags It is automatically activated (2\ [25]25

Q10— Section header —

10.1Supercharger Roots Twin screw entrifugal Vane type

10.2Supercharger function To improve the volumetric efficiency of an engine To make the car faster To increase the engine output / power Increase pressure in

10.3Advantages of supercharger Supercharger has no turbo lag Supercharge r is less expensive Supercharger is less complicated to mount Supercharger has less moving parts ore efficient at lower revs. No special shutdown procedure.

10.4Turbocharger the exhaust gases.

10.5Runaway speed The runaway speed of a water turbine is its speed at f ull flow and with no shaft load. (2\ Water turbines

10.6.1Reaction principle Francis OR Description of operation: Reaction turbines are act on by water w changes pressure as it moves through the turbine and gives up its

10.6.2

10.6.3Reaction principle Kaplan Description of operation: Reaction turbines are acted on by water whi h changes pressure as it moves through the turbine and gives up its

Mathematical Content

f(x)trig

Topics Identified

CircuitsMaterialsConstruction

Mark Allocation

Total215 marks

Sections20 + 10 + 12 + 13 + 30 + 25 + 30 + 15 + 25 + 20 = 200 marks

Paper information

SubjectMechanical Technology

Year2016

SessionNovember

TypeMemo

PaperPaper 1

LanguageEnglish

Pages20

Downloads5

Examination context

Decade2010s

Years ago10y

SeasonSpring (SH)

Start daySaturday

Exam periodNovember 2016

Days since exam3,642

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