Key term
CCEA A-Level Technology and Design 8900
Material Selection and Wood
Metals
Plastics
Composite and Emerging Materials
Processing Materials
Product Analysis and Design Communication
Design for Manufacture, Quality and Safety
Electronic Control SystemsOption A
Topic overviewControl systems, feedback and electronics safetyResistors, Ohm's law and power ratingsCapacitors and RC timingPotential dividers, sensors and comparatorsSwitches, pull-up and pull-down resistorsOutput devices and LEDsTransistors, Darlington pairs and thyristorsLogic gates, truth tables and flip-flops555 monostable and astable timers
Microelectronic Control SystemsOption A
Topic overviewMicrocontroller systems, ADCs and DACsStrain gauges and bridge circuitsOptical switches, encoded discs and Schmitt triggersOp-amp amplifiers and gainZener diodes and voltage regulatorsKarnaugh maps and binary countersSeven-segment, LCD and dot matrix displaysPIC flowcharts and programmingDC motors, stepper motors and driver circuits
Mechanical and Pneumatic ComponentsOption B
Topic overviewOpen and closed loop mechanical and pneumatic controlSafe working with compressed air and mechanismsLevers, linkages and momentsGear types and gear trainsPulleys, belts, chains and shaft fixingsCams, cranks and converting motionCompressed air supply and pneumatic valvesCylinders, shuttle valves, restrictors and reservoirsPneumatic circuits for logic, timing and speed control
Mechanical and Pneumatic SystemsOption B
Topic overviewHydraulics, system limitations and plant safetyTorque, work, power and air consumptionVacuum handling, proximity sensors and 5/3 valvesSequential and cascade pneumatic circuitsCam profiles and follower displacement diagramsGear geometry, pulley blocks and ratchetsToggles, treadles, shafts and couplingsFriction, brakes and clutchesBearings, lubrication and seals
Designing and Manufacturing ProductsOption C
Topic overviewResearch, questionnaires and specificationsIdea generation, critiques and computer simulationManufacturing planning and product evaluationCFRP, GRP, Kevlar and tungsten carbideSmart materials, nanotechnology and biophotovoltaicsIsometric, perspective and assembly drawingLaminating, steam bending, cutting and printing processesRisk assessment and product safety lawScales of production, JIT and cell productionQuality assurance, ISO 9001 and continuous improvementDesign influences and intellectual property rights
Product Design in Industry and SocietyOption C
Topic overviewLife-cycle environmental impact and climate changeThe 6Rs, waste and environmental legislationSustainable metals, plastics and degradable polymersProduct life cycles, consumer types and relaunchesCAD, CAM, 3D scanning and quick-change mouldingMarket pull, technology push and market strategyPrice, place and promotionJigs, fixtures and ICT in quality controlDesign for maintenance, inclusion and scale productionRendering, typography and presentationDyson, Baylis, Memphis and Apple
Product Development
Product and System Design and Manufacture
Metals
Ferrous and non-ferrous metals and alloys
- 3 things to know
- AS 1 Paper 1
Overview
Ferrous and non-ferrous metals, alloys and why they are stronger, magnetic sorting, outdoor use, copper wiring, steel in structures, recycling and the environmental cost of metals.
What you need to know
Answer each one before you reveal it.
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Key term
What is a non-ferrous metal?
Key term
Why do non-ferrous metals not rust?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is a ferrous metal?
Model answer
A ferrous metal is one that contains iron. Most ferrous metals are magnetic and rust unless protected.
- 2
What is a non-ferrous metal?
Model answer
A non-ferrous metal is one that contains no iron. Aluminium, copper and zinc are non-ferrous metals.
- 3
Why do non-ferrous metals not rust?
Model answer
Rust is an oxide of iron, so only metals containing iron can rust. Many non-ferrous metals also form a thin oxide film that resists further corrosion.
- 4
How can a magnet be used to sort scrap metal, and what is its limitation?
Model answer
A magnet attracts most ferrous metals and separates them from non-ferrous ones. Some stainless steels are not magnetic, so a magnet alone can misclassify them.
- 5
What is an alloy?
Model answer
An alloy is a mixture of a metal with one or more other elements. The added elements change properties such as strength, hardness or corrosion resistance.
- 6
Explain why an alloy is usually stronger and harder than the pure metal it is based on.
Model answer
A pure metal has regular layers of atoms that slide over one another easily. Atoms of a different size disrupt the layers, so the alloy resists deformation.
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