QCE Engineering: complete 2026 guide to Units 3 and 4 (General subject)
A complete 2026 guide to QCE General Engineering Units 3 and 4. Covers the internal data test, the internal project work, the External Assessment examination, what each instrument assesses, how the marks combine, and links to every dot-point answer we have written for Unit 3 (civil structures, statics, stress and strain, trusses, beams, materials) and Unit 4 (machines and mechanisms, mechanical.
QCE General Engineering Units 3 and 4 is the Year 12 sequence assessed across three internal assessments and one External Assessment. It is an applied, practical discipline that uses science and mathematics to solve real-world problems. Unit 3 (Civil structures) develops statics and materials science; Unit 4 (Machines and mechanisms) develops the analysis of machines and the engineering problem-solving process. The EA tests Units 3 and 4 cumulatively at the end of the year.
This page is the index. Below you will find the structure of the course, what each instrument assesses, and links to every dot-point answer we have written for QCE Engineering.
The four instruments in 2026
- IA1: Data test
- A short internal response in which students apply formulas and interpret supplied data, drawings and results from material or structural testing. It assesses the ability to calculate and interpret rather than to design.
- IA2: Project or engineered solution (Unit 3)
- Extended school-based project work in which students apply the problem-solving process to a civil-structures brief, developing and justifying a solution with calculations, analysis and evaluation against criteria.
- IA3: Project or engineered solution (Unit 4)
- Extended school-based project work applying the problem-solving process to a machines and mechanisms brief, again developing and justifying a solution with evidence.
- EA: External Assessment
- A centrally set external examination at the end of Unit 4, marked by QCAA, assessing Units 3 and 4 cumulatively. Confirm the weighting of every instrument against the current syllabus.
Unit 3: Civil structures
Unit 3 applies mechanics and materials science to structures. It is the basis of the Unit 3 project and contributes to the EA.
- Forces and equilibrium
- Force as a vector, resolving into perpendicular components, free-body diagrams, and the three conditions of static equilibrium used to find reactions.
- Stress, strain and stiffness
- Axial stress, strain, Young's modulus, Hooke's law and the elastic region of the stress-strain diagram.
- Material properties and selection
- Strength, stiffness, ductility, hardness and toughness, and justifying a material choice for a structural application.
- Trusses and beams
- Analysing pin-jointed trusses by the method of joints, and finding shear force and bending moments in simply supported beams.
Unit 4: Machines and mechanisms
Unit 4 analyses machines and mechanisms and develops the problem-solving process. It is the basis of the Unit 4 project and contributes to the EA.
- Machines in society and motion
- Recognising basic machines and the four types of motion, and the role of machines in solving problems.
- Mechanical advantage and efficiency
- Mechanical advantage, velocity ratio and efficiency of levers, pulleys and inclined planes, and the force-distance trade-off.
- Gears and mechanisms
- Gear ratios, output speed and torque, idler gears and compound trains, and the speed-torque trade-off.
- The problem-solving process and machine control
- Exploring, developing, generating and evaluating a justified machine solution using data and criteria.
Our 2026 QCE Engineering dot-point answers
Every link below is a focused answer to one QCAA subject-matter dot point. Each page identifies the dot point, gives a worked answer with correct physics and units, and flags the mistakes QCAA markers penalise.
Unit 3: Civil structures
- Types of civil structures and structural form
- Dead, live and environmental loads on structures
- Forces, equilibrium and free-body diagrams
- Moments and support reactions
- Stress, strain and Young's modulus
- Reading the stress-strain diagram
- Factor of safety and working stress
- Material properties and selection
- Material testing methods
- Truss analysis by the method of joints
- Beams, shear force and bending moments
Unit 4: Machines and mechanisms
- The four types of motion
- Levers and simple machines
- Mechanical advantage, velocity ratio and efficiency
- Torque and rotational power
- Gears, gear ratios and mechanisms
- Belt and chain drives
- Cams and followers
- Linkages and four-bar mechanisms
- Machine control systems
- The engineering problem-solving process
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