Engineering - Exam Papers - HL - Paper - 2003
300 Marks
Answer Question 1, Sections A and B and FOUR other questions.
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1.
(100 Marks)
Section A - 50 Marks
Give brief answers to any ten of the following :
| (a) | Distinguish between the narcotic and irritant effects of toxic materials. |
| (b) | Name two properties of materials used to facilitate ore dressing. |
| (c) | Identify the main process used to manufacture the vice shown. |
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| (d) | Differentiate between ionic and covalent bonding in solids. |
| (e) | Identify and state a purpose for the electronic component shown. |
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| (f) | Explain the function of the flashback arrest ers used in oxyacetylene welding. |
| (g) | State a suitable material for manufacturing the greenhouse shown and give three reasons why this material is suitable. |
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| (h) | What environmental factors affect the corrosion rate of metals? |
| (i) | Outline the advantages of using pneumatic power over electrical power. |
| (j) | What is meant by factor of safety ? |
| (k) | Distinguish between the two pneumatic cylinders shown |
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| (l) | What contribution did any one of the following make to technology: (i) German Sommeiller. (ii) Jack Kilby. (iii) Chester Carlson. |
| (m) | Identify the mechanism shown below and outline two suitable applications. |
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Section B - 50 Marks
Answer all of the following :
| (n) | Outline the function of a compressor in a refrigeration system. |
| (o) | Name three types of compressors commonly used in refrigeration. |
| (p) | (i) Identify the compressor system shown in the diagrams below. (ii) Utilising the diagrams, describe the principle of operation of this compressor system. |
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| (q) | Explain the meaning of non-positive displacement in a compressor system. |
| (r) | With reference to compression cycle refrigerators: (i) Name two parts located in the low pressure side. (ii) Name two parts located in the high pressure side. |
2.
(50 Marks)
| (a) | (i) | Explain the term creep with reference to metals. | |||||||||||||||||
| (ii) | State two factors that affect the behaviour of creep in metals. | ||||||||||||||||||
| (b) | A tensile test on a specimen material gave the following results: | ||||||||||||||||||
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| Using the graph paper supplied, plot the stress-strain graph and determine: | |||||||||||||||||||
| (i) | The 0.2% proof stress; | ||||||||||||||||||
| (ii) | Young's Modulus of Elasticity for the material. | ||||||||||||||||||
| (c) | (i) | Name two non-destructive tests used to detect internal flaws in metals. | |||||||||||||||||
| (ii) | Describe, with the aid of a diagram, one of these tests. | ||||||||||||||||||
3.
(50 Marks)
| (a) | Explain any two of the following terms used in the heat treatment of steel. | |
| (i) | Ferrite; | |
| (ii) | Cementite; | |
| (iii) | Martensite; | |
| (iv) | Tempering; | |
| (v) | Normalising. | |
| (b) | Copy the simplified iron-carbon equilibrium diagram into your answer book. With reference to the diagram, describe how 0.5% carbon steel may be heat treated to produce: |
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| (i) | A soft condition; | |
| (ii) | A tough condition. | |
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| (c) | (i) | Name two methods of measuring furnace temperature. |
| (ii) | Describe the principle of operation and give a suitable application for one method. | |
4.
(50 Marks)
| (a) | Differentiate between any two of the following: | ||||||||||||||||||||||||||||||||||||
| (i) | Interstitial solid solution and substitutional solid solution; | ||||||||||||||||||||||||||||||||||||
| (ii) | Crystalline and amorphous structures; | ||||||||||||||||||||||||||||||||||||
| (iii) | Solvus and solidus; | ||||||||||||||||||||||||||||||||||||
| (iv) | Body centred cubic and face centred cubic; | ||||||||||||||||||||||||||||||||||||
| (v) | Simple eutectic and a solid solution. | ||||||||||||||||||||||||||||||||||||
| (b) | The given table shows the solidification temperatures for various alloys of two metals A and B. The melting points of A and B are 270°C and 630°C respectively. | ||||||||||||||||||||||||||||||||||||
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| Using the graph paper supplied: | |||||||||||||||||||||||||||||||||||||
| (i) | Draw the equilibrium diagram according to the given data; | ||||||||||||||||||||||||||||||||||||
| (ii) | Label the diagram and describe the main features; | ||||||||||||||||||||||||||||||||||||
| (iii) | For the alloy of 60% B determine, from the diagram, the ratio of the phases at 450°C. | ||||||||||||||||||||||||||||||||||||
| (c) | (i) | Describe, with the aid of a diagram, a dislocation defect. | |||||||||||||||||||||||||||||||||||
| (ii) | Suggest one method of restricting the movement of a dislocation. | ||||||||||||||||||||||||||||||||||||
5.
(50 Marks)
| (a) | Describe the welding process shown below using the following guidelines: | |
| (i) | Name; | |
| (ii) | Method of operation; | |
| (iii) | Applications. | |
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| (b) | Answer any three of the following: | |
| (i) | State two safety precautions associated with oxy-acetylene welding; | |
| (ii) | Outline two functions of the electrode coating in manual metal arc welding: | |
| (iii) | What are the benefits of multi-run welds over single-run welds? | |
| (iv) | Compare primary and secondary combustion in the oxy-acetylene flame. | |
| (c) | Describe, with the aid of a diagram, the main features of a transformer used in manual metal arc welding. | |
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| (c) | Outline two advantages of the use of robotic control in welding. | |
6.
(50 Marks)
| (a) | Describe the process shown in the diagram below using the following guidelines: | |
| (i) | Principle of operation; | |
| (ii) | Identify one component produced; | |
| (iii) | Name the parts A. B, C, D and E. | |
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| (b) | Explain any two of the terms: | |
| (i) | Parison; | |
| (ii) | Monomer; | |
| (iii) | Vulcanisation; | |
| (iv) | Catalyst. | |
| (c) | Discuss the three main polymer groups with reference to the following: | |
| (i) | Chemical Bonding; | |
| (ii) | Internal Structure; | |
| (iii) | Properties. | |
7.
(50 Marks)
| (a) | With reference to the drill shown below, describe any three of the parts A, B, C, D, E and F. | |
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| (b) | Answer any three of the following: | |
| (i) | Outline the benefits of using cutting fluids when machining; | |
| (ii) | Describe the purpose of a sine bar; | |
| (iii) | Suggest two different ways of mounting cutters on a milling machine; | |
| (iv) | Describe one use of the dividing head. | |
| (c) | Compare three different types of machine tool for machining flat surfaces using the following guidelines: | |
| (i) | Names; | |
| (ii) | Methods of operation; | |
| (iii) | Applications. | |
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| (c) | With reference to CNC machining, describe the meaning of any three of the following terms: | |
| (i) | Linear interpolation; | |
| (ii) | Canned cycle; | |
| (iii) | Rapid traverse; | |
| (iv) | Continuation code; | |
| (v) | Stepper Motor. | |
8.
(50 Marks)
| (a) | Name one drive mechanism shown and outline a suitable application. | |
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| (b) | Explain the function of any two of the following: | |
| (i) | Electrical relay; | |
| (ii) | Rectifier; | |
| (iii) | Transistor; | |
| (iv) | Shuttle valve; | |
| (v) | Clutch. | |
| (c) | Describe the operation and function of a quick-return mechanism. | |
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| (c) | Describe the operation of the circuit shown and outline an application for its use. | |
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