Engineering - Exam Papers - OL - Paper - 2006
200 Marks
Answer Question 1, Sections A and B and THREE other questions.
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1.
(65 Marks)
Section A - 30 Marks
Give brief answers to any six of the following :
| (a) | Identify two areas of work where it is essential to wear safety goggles. |
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| (b) | State the purpose of any one of the following in electronic circuits: (i) Printed circuit board (PCB), (ii) Light emitting diode (LED), (iii) Switch. |
| (c) | Name the alloy produced from the metals lead and tin. |
| (d) | State the purpose of an electrical insulator. |
| (e) | Give a typical application for the vacuum forming process. |
| (f) | For any two of the
following thread forms, identify a suitable
application: (i) Square thread, (ii) Acme thread, (iii) Buttress thread. |
| (g) | Name two computer input devices. |
| (h) | Name one of the gauges shown. |
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Section B - 35 Marks
Answer any three of the following :
| (i) | Describe the function and
operation of any one of the following: Plastic dip coating tank, Morse taper sleeve, Vee blocks and clamp. |
| (j) | Explain any two of the
computing terms: Virus, Computer network, Hard disk, USB port. |
| (k) | Describe the difference between a compressive force and a tensile force. |
| (l) | Explain any two of the
terms: Fuse, Surface plate, Voltmeter, Pop rivet. |
| (m) | Name one of the mechanisms shown. |
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2.
(45 Marks)
| (a) | (i) | Name a furnace used in the production of steel. |
| (ii) | Make a sketch of this furnace and explain its operation. | |
| (b) | State a suitable application for any three of the following metals: | |
| (i) | Stainless steel, | |
| (ii) | Copper, | |
| (iii) | Cast iron, | |
| (iv) | Brass. | |
| (c) | Describe any two of the following terms: | |
| (i) | Galvanised steel, | |
| (ii) | Bright mild steel, | |
| (iii) | Tinplate. | |
| (d) | Name the ore from which one of the following is produced: | |
| (i) | Aluminium, | |
| (ii) | Lead, | |
| (iii) | Iron. | |
3.
(45 Marks)
| (a) | Explain the condition of high carbon steel when: | |
| (i) | Cooled quickly from a temperature of 900°C; | |
| (ii) | Allowed to cool slowly from a temperature of 900°C. | |
| (b) | Explain any two of the following terms in relation to the properties of metals: | |
| (i) | Toughness, | |
| (ii) | Malleability, | |
| (iii) | Elasticity. | |
| (c) | What does case hardening mean? | |
| (d) | Identify two safety precautions required when working with hot metals. | |
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| (d) | Give two applications for the pneumatic compressor shown. | |
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4.
(45 Marks)
| (a) | Identify the three types of oxy-acetylene flame shown: | |
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| (b) | (i) | Describe the basic differences between soft soldering and manual metal arc welding. |
| (ii) | Suggest one suitable application for each process. | |
| (c) | (i) | State the purpose of a flux when soldering. |
| (ii) | When soldering electrical circuits, which of the fluxes, active or passive, is used? | |
| (iii) | Give a reason for your answer in (ii). | |
| (d) | State two health hazards associated with welding procedures. | |
5.
(45 Marks)
| (a) | Describe one of the following processes used in the manufacture of plastic components and identify the component produced. | |
| (i) | Injection moulding, | |
| (ii) | Compression moulding, | |
| (iii) | Blow moulding. | |
| (b) | Identify the types of plastic which: | |
| (i) | Softens when heated; | |
| (ii) | Remains hard when heated. | |
| (c) | Identify two safety precautions to be observed when drilling acrylic sheet. | |
| (d) | Name the plastics used in the manufacture of: | |
| (i) | Fishing line, | |
| (ii) | Bin liners. | |
6.
(45 Marks)
| (a) | Describe a suitable application for any three of the following lathe parts: | ||
| (i) | Faceplate, | ||
| (ii) | Three jaw chuck, | ||
| (iii) | Knurling tool, | ||
| (iv) | Four jaw independent chuck. | ||
| (b) | (i) | Name the tool angles indicated on the lathe cutting tool shown. |  |
| (ii) | State the purpose of one of the tool angles indicated. | ||
| (c) | Describe, using sketches, any two of the following turning operations: | ||
| (i) | Parallel turning, | ||
| (ii) | Taper turning, | ||
| (iii) | Facing. | ||
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| (c) | Identify two safety precautions to be taken when machining on a CNC lathe. | ||
7.
(45 Marks)
| (a) | Name any two types of fit in the assembly of a shaft and hole. | ||
| (b) | A hole is produced in a steel plate to the dimensions shown. State the | ||
| (i) | Nominal diameter of the hole; |  |
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| (ii) | Maximum diameter of the hole; | ||
| (iii) | Minimum diameter of the hole; | ||
| (iv) | Tolerance of the hole. | ||
| (c) | Name the measuring instrument shown and identify any two of the parts indicated. | ||
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| (c) | Identify any three of the electronic symbols shown: | ||
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