Engineering and Manufacturing comes down to one 100 mark paper built half on pre-release material you see in January. Precise material vocabulary and full working for follow-through marks are what separate the grades.
阅读时间 4 分钟更新于: 2026年9月3日
试卷概览
卷数
1
总分
100
考试时间
2小时
题型
12
试卷
时间
分数
题数
比重
题型
Unit 3: Materials, Processes and Systems
2小时
100
11
50%
Short Answer & Forming Processes, Standards, Safety & Factors of Safety, Stress, Strain & Young's Modulus Calculations, Mechanism Design & Exploded Technical Sketching, Extended Prose Essay (QWC Assessment), Component Identification & Regulatory Bodies, Composite Materials & Material Properties, Manufacturing Costs, Batch Production & CAD, Pneumatic Circuits & Principle of Moments, Material Volume, Wastage & Stock Length Calculations, Emerging Technologies, Energy Efficiency & Sustainability
评级
A*ABC*CDEFGU
计算器规定
The specification does not state a calculator restriction for Unit 3, so the general CCEA and JCQ default applies: a calculator is permitted, provided it holds no stored or retrievable information, no saved formulae, text or programs, and offers no symbolic algebra function. Materials, stress and strain, and stock-waste calculations on this paper are graded on the method shown as much as the final figure, so a calculator answer without working can still lose marks.
AO1: AO1: recall, select and communicate their knowledge and understanding of engineering and manufacturing in a range of contexts (30%)
AO2: AO2: apply skills, knowledge and understanding, including quality standards, in a variety of design contexts, and plan and carry out investigations and making tasks involving an appropriate range of tools, equipment, materials and processes (40%)
AO3: AO3: analyse and evaluate evidence, design proposals and outcomes, make reasoned judgements and present conclusions and recommendations (30%)
Memory key for repeated kerf-adjusted stock calculations
用途: Get how many pieces a length of stock will yield once the piece length plus kerf is stored, without re-adding the kerf for every stock length in the question.
使用时机: For stock-cutting or material-yield questions in the pre-release material that ask how many pieces can be cut from several different stock lengths.
步骤
Store the piece length plus kerf as a single figure in the calculator's memory once, then divide different stock lengths by that recalled figure across several parts of the same question instead of re-adding the kerf every time.
考试提示: The memory here holds a value calculated live for that specific question, not a saved formula. No conversion factor, dimension or program may be stored in the calculator before the exam begins.
ANS key through stress, strain and Young's modulus
用途: Get Young's modulus directly from calculated stress and strain values without writing down and retyping a rounded intermediate figure.
使用时机: For questions that ask you to calculate stress and strain from given figures and then find Young's modulus.
步骤
Calculate stress and strain as separate steps, then divide one ANS by the other to find Young's modulus in the same continuous sequence, rather than writing down and retyping a rounded intermediate value.
考试提示: This is a live keystroke sequence performed during the exam on that question's figures. No formula for stress, strain or Young's modulus may already be stored in the calculator.
Power and pi keys for area and volume calculations
用途: Get the cross-sectional area or volume of round stock directly from a radius, without working out the square by hand first.
使用时机: For questions asking for the cross-sectional area or volume of round bar or other cylindrical stock.
步骤
Use the calculator's squared and pi keys directly when working out cross-sectional area or volume of round stock, entering the radius once and letting the calculator square and multiply it, rather than working out the square by hand first.
考试提示: This uses the calculator's ordinary arithmetic and constant keys live during the exam, not a stored program. Show the formula \( A = \pi r^2 \) as a written line before the substitution, since the method is assessed as well as the answer.
常见错误
1high涉及分数: 2Material properties
Material properties are described with general, non-technical words, strong, light or hard, instead of the precise engineering property the mark scheme wants.
如何避免: Pair every everyday description with its technical equivalent as you revise: strong becomes high tensile strength, light becomes low density, hard becomes wear resistant. Use the technical term in your answer, not the everyday one.
2high涉及分数: 3Materials calculations and waste
Stock length and material yield calculations divide the available length by the piece length alone, without allowing for the kerf, the width of material lost to each saw cut.
如何避免: Add the kerf width to the piece length before dividing into the available stock length, since every cut removes an extra sliver of material beyond the piece itself.
3high涉及分数: 4Mechanism design sketching
Mechanism design sketches are submitted as a single flat 2D outline, without exploded views, annotation, or labelling of pins, fasteners and clamping points.
如何避免: Draw the mechanism pulled apart along its assembly axis, with every fastener and joint labelled and standard component symbols used, not a single flat outline no matter how accurate the shape is.
4medium涉及分数: 2Materials calculations
Volume and density calculations mix centimetres cubed and millimetres within the same working, producing an answer out by a factor of a thousand.
如何避免: Convert every measurement to the same unit before starting the calculation, and write that conversion as its own line of working rather than doing it in your head partway through.
5medium涉及分数: 2Area and volume calculations
Area calculations use the diameter directly in \( A = \pi r^2 \) instead of halving it to get the radius first.
如何避免: Check whether the question gives a diameter or a radius before you substitute into the area formula, and halve a diameter to get the radius every time, as a fixed first step.
6medium涉及分数: 1Stress, strain and moments
Final answers for Young's modulus and moments calculations omit the correct unit, newtons per square millimetre for Young's modulus, newtons for a moment.
如何避免: State the unit on the final line of every calculation as a fixed habit, not just when the question prints a blank unit box for you to fill in.
7medium涉及分数: 5Extended writing (QWC)
The extended prose essay on automation and emerging technology covers only the advantages, increased efficiency or output, without discussing disadvantages such as job losses or retraining costs.
如何避免: Plan both sides of the essay before writing: the efficiency and output gains on one side, the workforce and financial costs on the other, and develop both rather than only one.