Specialist Techniques Exam Practice (AQA Paper 1 Style)

This lesson provides exam-style questions and worked answers covering specialist techniques, processes and finishes from AQA GCSE Design and Technology (8552), Sections 3.2.8 and 3.2.9. These topics appear on Paper 1: Core Technical Principles (2 hours, 100 marks, 50% of GCSE).

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How Specialist Techniques Are Tested

Questions on specialist techniques typically appear as:

• Short-answer questions (1–2 marks) — name a tool, state a treatment, identify a process.
• Medium-answer questions (3–4 marks) — describe a process, explain a choice of tool or finish.
• Extended-response questions (6–8 marks) — compare processes, justify a surface treatment for a named product.

AQA Exam Tip: Read the question carefully. "Name" and "state" require brief answers. "Describe" requires a step-by-step account. "Explain" requires reasons/justifications. "Compare" requires similarities AND differences.

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Worked Example 1: Short Answer (2 marks)

Question: Name one advantage of using a jig when drilling holes in a batch of 50 identical components.

Model Answer: A jig guides the drill bit to the correct position each time, ensuring all 50 components have holes drilled in exactly the same location. This improves consistency and accuracy across the batch. (2 marks: one for naming the advantage, one for linking to batch production.)

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Worked Example 2: Medium Answer (4 marks)

Question: Describe how powder coating is applied to a mild steel bicycle frame.

Model Answer:

1. The bicycle frame is cleaned and degreased, often by shot blasting, to remove rust and contaminants.
2. The frame is hung on a rack and connected to an electrical earth.
3. Coloured polymer powder is sprayed onto the frame using a powder coating gun that gives each powder particle a positive electrostatic charge. The charged particles are attracted to the earthed frame and cling to the surface evenly.
4. The coated frame is placed in an oven at approximately 180–200 °C for 10–20 minutes, where the powder melts, flows together and cures to form a hard, durable, even coating.

(4 marks: one for each clearly described stage.)

AQA Exam Tip: For "describe" questions, use numbered steps and include technical details such as temperatures and processes. This shows depth of knowledge and earns higher marks.

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Worked Example 3: Extended Response (6 marks)

Question: A company manufactures a range of custom sports jerseys in batches of 100. Compare screen printing and sublimation printing as methods for adding the design. Recommend which method the company should use. Justify your answer.

Model Answer:

Factor	Screen Printing	Sublimation Printing
Process	Ink pushed through mesh screens; one screen per colour	Digital design printed on transfer paper, then heat-pressed onto polyester
Colours	Each colour requires a separate screen, increasing cost and set-up time	Full-colour, photo-quality images with no limit on colours
Durability	Ink sits ON the surface; can crack or peel after repeated washing	Dye is embedded IN the fabric; will not crack, peel or fade easily
Material	Works on cotton, polyester and blended fabrics	Only works on polyester (minimum 65%) and white/light colours
Cost at 100 units	Higher set-up cost but lower per-unit cost for simple designs	Lower set-up cost; per-unit cost is similar regardless of complexity
Customisation	Changing the design requires new screens	Each jersey can have a different name/number at no extra cost

Recommendation: Sublimation printing is the better choice for custom sports jerseys because:

• Jerseys are made from polyester, which is suitable for sublimation.
• Each jersey likely needs a different player name and number, and sublimation handles customisation with no additional set-up cost.
• The dye is embedded in the fabric, making it more durable for sportswear that is washed frequently.
• Full-colour designs (team crests, sponsor logos) are printed without extra screens.

(6 marks: 2 for comparison, 2 for recommendation, 2 for justified reasoning linked to the context.)

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Practice Questions

Question 1 (2 marks)

A manufacturer uses a go/no-go gauge to check the diameter of turned steel shafts. Explain how the gauge determines whether a shaft is within tolerance.

Key points for your answer:

• The go end (minimum acceptable size) — the shaft should pass through.
• The no-go end (maximum acceptable size) — the shaft should NOT pass through.
• If it passes the go end but not the no-go end, it is within tolerance.

Question 2 (3 marks)

Describe how anodising improves the properties of an aluminium drinks bottle.

Key points for your answer:

• Anodising thickens the natural oxide layer on aluminium using an electrolytic process (the bottle is the anode in a sulfuric acid bath).
• The oxide layer makes the surface harder and more scratch-resistant.
• The porous oxide layer can be dyed to add colour, then sealed for permanence.
• The oxide layer improves corrosion resistance.

Question 3 (4 marks)

A designer is creating a one-off wooden jewellery box. Recommend a suitable surface treatment and justify your choice.

Key points for your answer:

• Recommend oiling (Danish oil) or waxing (beeswax).
• Oil penetrates the grain, enhancing the natural beauty of the wood.
• A jewellery box is a low-wear, indoor item, so the moderate protection of oil or wax is sufficient.
• Oil/wax can be reapplied easily if the finish dulls over time.
• Paint would be inappropriate as it would hide the decorative grain.

Question 4 (6 marks)

A manufacturer produces 5,000 cardboard packaging nets per day. Compare die cutting and laser cutting as methods for producing these nets. Recommend which method is more suitable and justify your answer.

Key points for your answer:

Factor	Die Cutting	Laser Cutting
Speed	Very fast — cuts and creases in one press action	Slower — follows the outline of each net individually
Set-up cost	High — a custom steel die must be made	Lower — only a CAD file is needed
Per-unit cost at 5,000/day	Very low — die lasts for millions of cycles	Higher — slower cycle time increases cost
Creasing	Die can cut AND crease simultaneously	Separate creasing operation needed
Flexibility	Changing design requires a new die	Design changes are instant (edit CAD file)

Recommendation: Die cutting is more suitable because at 5,000 units per day, the high set-up cost is justified by the very low per-unit cost and fast cycle time. The die can also crease fold lines in the same operation, which is essential for packaging nets.

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Common Mistakes to Avoid