Mechanical Technology Paper 1 (English)

Feb-March 2015 — Grade 12 / Matric — Mechanical Technology

Past Paper 2015 Grade 12 English

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🎯 200 marks ⏱️ 3h 📄 18 pages 📝 142 items found 📚 4 topics

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142

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Q1— Section header —

1.20\ in the ANSWER BOOK, for example 1.21 A.

1.1What safety precaution is applicable to the MIG /MAGS welding process Always use a striker to light the torch and not a m atch or lighter

1.2Which hardn ess tester uses a steel ball to determine the hardness of steel? Vickers tester Rockwell tester Victor tester Brin ell

1.3The gas an lyser is used during the fuel mixture setting of a motor car engine. Which ONE of the following is the CORRECT

1.4he function of the tensile tester To etermine the compressive stress and ultimate pus hing stress on a piece of a material

1.5

1.6teel can be hardened and annealed at temperature between and . Wh percentage carbon content wil allow for

1.7Name the tool that is used to set the cutting tool perpendicular to the axis of the wor piece when cutting a screw thread on

1.8What is the standard ratio of a taper key 1 in 50 1 in 100 1 in 150 1 in (1\ 0,2

1.9What defect appears as a groove in the parent metal, directly along the edges of the weld? ndercutting lag inclusion orosity ncomplete penetration (1\

1.10Which ONE of the f ollowing is a ample of a destructive test? ray test Liquid

1.1

1.1Which ONE of the following statements describes Pascal s law The area is inversely proportional to the pressure on it if the temperature remains constant The pressure exerted on th

1.1The f ollowing statement describes an advantage of a belt drive system compared to a gear drive system: tronger eeds no lubrication hanges direction

1.14Calculate the strain when tensile orce causes a stress of 6 MPa in a work piece. The material has an elasticity module of 3 GPa 2 x 10

1.15What is the composition of cutting fluid? Soluble oil and water Grease and water Engine o il and water Machine oil and water (1\

1.1What does the abbreviation ECU stand for in terms of the vehicle management system Economical control unit Electronic control unit Electricity control unit

1.1How is the supercharger driven? Hydraulically driven Gas driven Pneumatically driven Mechanically driven (1\

1.1uring a gas turbine application he auxiliary power unit is described gas turbine designed for auxiliary power. arge edium arger mall (1\

1.1orce is a vector unit which is recogni ed by magnitude only direction only magnitude and direction volume and direction

Q2— Section header —

2.1All personal and environmental safety rules have already been taken care when surface grinder is used

2.2Give TWO reasons w hy the pressure gauge of a hydraulic press must be tested regularly

2.3Why is it important to keep the copper tips of the spot weld constantly cool

2.4Describe the position of the following regarding the cylinder leakage test:

2.4.1Stroke (1\

2.4.2Piston (1\

2.4.3Valves (1\

2.5At what ang le to the bearing should a bearing puller be used? (1\ [10]10

Q3— Section header —

3.1Explain how a voltmeter and an ammeter are connected to a circuit (2\

3.2Describe the purpose of the following tests:

3.2.1Beam ending est (2\

3.2.2Cylinder eakage est (2\

3.3When Johnny conducted a dry compression test, the test indicated that the first cylinder had a very low reading. After conducting a wet test, the reading was higher. To what conclusion can Johnny

3.112

Q4— Section header —

4.1.1Ferrite

4.1.2Pearlite

4.2Determine the microscopic structure that best describes the compound of iron and carbon (iron carbide\ by analysing steel and cast iron. (2\ The table below

4.3.1, 4.3.2

4.3.3in the ANSWER BOOK. CARBON CONTENT TYPICAL USE HEAT TREATMENT PROPERTIES 0,1 0,25%

4.3.1Annealing Strong; durable Medium 0,25 0,55% Crankshafts; liers; screwdrivers

4.3.2Tough; hard surface High 0,55 1,00 Cutting tools; springs; hammers Hardening

4.3.3(3\ Define the terms below with reference to the iron carbon equilibri um diagram

4.4.1Lower critical point (AC (2\

4.4.2 Critical temperature (2\ [13]13

Q5— Section header —

5.1Explain step step how a metric V screw thread with a pitch of 1,5 mm is cut

5.2Calculate t he cutting depth of a metric V screw thread with a pitch of 2,5 using the compound slide method (3\

5.3Calculate the simple indexing needed to cut a gear with th.

5.4The length of a parallel key is 102 mm. Calculate

5.4.1The iameter of the shaft (3\

5.4.2The width of the key

5.4.3The thickness of the key

5.5Show, by means of neat labelled sketches, the difference between upcut milling downcut milling (4\ [30]30

Q6— Section header —

6.1shows a welding machine with different attachments FIGURE 6.1

6.1.1Identify the welding machine in F IGURE

6.1.2Label parts in FIGURE 6.1

6.2Explain the operating principle of the ray testing equipment as appli cable a welded joint

6.3State THREE advantages of etal rc hield welding (MIG /MAGS\

6.4What is the purpose of bend test? (2\

6.5State TWO causes of the following weld ing defects

6.5.1complete penetration (2\

6.5.2Welding craters (2\

6.6Which TWO aspects regarding welding techniques should be kept in mind during arc welding (2\ [25] 1125

Q7— Section header —

7.1Four forces of 150 N, 210 N, 250 N and 36 respectively as shown in FIGURE 7.1 below act on the same point alculat the magnitude and direction of the equilibrant for this system of forces

7.2A square steel bar with 100 sides subjected to a compressive force o f 80 kN. Determine by means of calculations the

7.3Defin Hooke s law

7.4FIGURE below shows a uniform beam that is supported by two vertical supports, . Two vertical point loads are exerted onto the be am, as well as a uniformly distributed load of 50 N/m, over the total left half of the

Q8— Section header —

8.1State TWO advantages of a cutting fluid (2\

8.2Define preventive maintenance (1\

8.3ar manufacturers recommend that the timing chain of a car engine be replaced every 90 00 km. Answer the questions that follow

8.3Give TWO r easons why a chain drive is preferred to belt drive

8.3Give TWO reasons why a stretched chain has to be replaced

8.3.3Explain in point form how you w ould remove and replace the timing chain of an engine (6\

8.4Why is it desira ble for engine oil to have a high flash point? (2\ [15]15

Q9— Section header —

9.1FIGURE 9.1 below shows gear system used to control a hoisting machine. The driver gear has 50 teeth and rotates at 660 . The idler gear that is used to change the direction rotates at 1 000

9.1.1The number of teeth on the idler gear (3\

9.1.2The rotation frequency of the driven gear in revolutions per second (3\ Driven gear Gear Gear Gear Driver gear

9.2The drive pulley of a belt drive system rotates at 1 640 r/min. The drive pulley has a diameter of 175 mm and the driven pulley a diameter of 80 mm. The belt thickness is 12 mm.

9.2.1The rotation frequency of the driven p ulley in revolutions per second (3\

9.2.2The belt speed of the system (3\

9.3A hydraulic system is used to compress scrap metal for recycling. The specifications of the system are presented diagrammatically in FIGURE 9.2. FIGURE 9.2 Determine by means of calculations:

9.3.1The fluid pressure in the hydraulic system in equilibrium (3\

9.3.2The force exerted by piston (4\

9.4Describe the purpose of the vehicle engine management system (4\

9.5Describe the purpose of the anti lock brake system (ABS\ (2\ [25] Piston A Piston B Load = 0 mm25

Q10— Section header —

10.1State TWO positive impac a water turbine will have on the environment and society. (2\

10.2Define the following terms regarding a water turbine:

10.2.1Specific speed

10.2.2Free load speed/Runaway speed

10.3State the function of a steam turbine (2\

10.4Name THREE types of s team turbine (3\

10.5What is the advantage of using gas turbines on na val vessels? (2\

10.6Define turbo boost (2\

10.7Explain in point form the operation of a twin screw super charger. (5\ [20] TOTAL:20

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5.5Mechanical Technology DBE/ Feb. Mar. 2015

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Topics Identified

CircuitsMachinesMaterialsConstruction

Mark Allocation

Total180 marks

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

Paper information

SubjectMechanical Technology

Year2015

SessionFeb-March

TypePast Paper

PaperPaper 1

LanguageEnglish

Pages18

Downloads5

Examination context

Decade2010s

Years ago11y

Season—

Start day—

Exam period—

Days since exam—

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