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
Mechanical and Pneumatic Components
Compressed air supply and pneumatic valves
- 3 things to know
- AS 1 Paper 2
Overview
Compressors, receivers and air mains, filter, regulator and lubricator units, 3/2 and 5/2 valves, trip, plunger, solenoid, pilot and diaphragm valves, and valve memory.
What you need to know
Answer each one before you reveal it.
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Key term
Describe how a compressor installation supplies compressed air.
Key term
What is the purpose of the receiver in a compressor installation?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Describe how a compressor installation supplies compressed air.
Model answer
An electric motor drives a compressor that pumps air into a receiver tank. A pressure switch starts and stops the motor to keep the receiver between set pressures.
- 2
What is the purpose of the receiver in a compressor installation?
Model answer
The receiver stores compressed air so demand can be met without the compressor running constantly. The receiver also smooths out pressure pulses and lets water condense out.
- 3
Why does an air main slope slightly, with branch lines taken from the top of the pipe?
Model answer
Water condensing in the main runs down the slope to a drain point. Branch lines taken from the top of the pipe keep that water out of the circuits.
- 4
What does the filter in a filter, regulator and lubricator unit do?
Model answer
The filter removes water droplets, dirt and pipe scale from the air. The air is swirled so particles are thrown out into a bowl that can be drained.
- 5
What does the regulator in a filter, regulator and lubricator unit do?
Model answer
The regulator reduces the supply pressure to the working pressure a circuit needs. The regulator holds that pressure steady as demand changes. A gauge shows the set pressure.
- 6
What does the lubricator in a filter, regulator and lubricator unit do?
Model answer
The lubricator adds a fine mist of oil to the air. The oil lubricates the moving parts of valves and cylinders and reduces wear.
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