Investigate the structure and purpose of engineering reports in HSC Engineering Studies, the Australian drawing standards (AS 1100 series, orthographic projection, IEC circuit symbols), block diagrams and data sheets, and the application of these conventions to a telecommunications subsystem

What this dot point is asking

NESA's Engineering Studies syllabus makes engineering reports mandatory school-based components: one per HSC module, with at least one in Year 12 contributing 20 percent or more of the school-based assessment mark, and at least one HSC report completed collaboratively. The HSC written exam also tests the communication skills the reports develop, including diagram interpretation, calculation presentation, and structured argument. This dot point covers the report structure NESA expects, the Australian drawing standards (AS 1100 series), the circuit and block-diagram conventions, and how to apply them to a telecommunications subsystem.

The answer

Why engineering reports exist in the HSC

The 2011 Engineering Studies syllabus treats the engineering report as the way students demonstrate the full engineering method: define a problem, research, calculate, design, evaluate, communicate. Band 6 performance band descriptors require students to "construct and evaluate engineering reports in order to recommend and predict solutions to engineering problems". The reports also build the technical-writing skills the HSC written paper rewards in longer-response questions.

Mandatory report structure

A typical NESA-compliant engineering report follows this skeleton:

1. Title page. Project name, author, school, date, module.
2. Executive summary or abstract. A short paragraph stating the problem, approach and main conclusion.
3. Introduction. Background, scope, why the project matters.
4. Aim. A single sentence describing what the report sets out to achieve.
5. Background research. Literature and prior-art review; existing solutions; standards that apply.
6. Method. What the engineer did, step by step.
7. Calculations. Force balances, electrical analyses, signal budgets. Each calculation shows formula, substituted values, units, and answer to appropriate precision.
8. Technical drawings. Orthographic views, assembly drawings, circuit schematics, block diagrams.
9. Materials and components list. What was used, with quantities and references to data sheets.
10. Results. What was observed or measured.
11. Discussion / Evaluation. What the results mean; how the design met the aim; what would be done differently.
12. Conclusion. A short restatement of outcome and significance.
13. References. All sources, including standards (cite by number, e.g. AS 1100.101-1992).
14. Appendices. Raw data, full drawings, source code, data sheets.

The expected length and depth vary by school and weighting, but the structure above is the conventional template.

Drawing conventions: AS 1100 series

The Australian Standard AS 1100 series governs technical drawing in Australia. The relevant parts for HSC students:

• AS 1100.101. General principles: paper sizes, scales, line types, lettering, title blocks.
• AS 1100.301. Mechanical engineering drawing: orthographic views, sectional views, dimensioning, surface texture.
• AS 1100.401. Engineering survey drawing.
• AS 1100.501. Structural engineering drawing.

Key conventions students must apply:

• Orthographic projection (first-angle). Australia uses first-angle projection: the views (front, top, side) are arranged with the top view below the front, the right side view to the left of the front, etc. (This contrasts with third-angle projection used in the United States.) A symbol on the drawing identifies which projection has been used.
• Line types. Continuous thick (visible edges); continuous thin (dimensions, leaders); dashed (hidden edges); chain (centrelines, axes); chain-thick (cutting planes).
• Dimensioning. Dimensions in millimetres unless otherwise stated; arrowheads; clear separation from the object; consistent placement.
• Title block. Bottom-right, with drawing title, drawn-by, checked-by, date, scale, drawing number.

Circuit diagram conventions: IEC symbols

Electrical and electronic schematics use IEC 60617 symbols (International Electrotechnical Commission). Selected examples HSC students should recognise:

• Resistor: a rectangle (IEC) or zig-zag (older ANSI style; either is usually accepted at HSC level if consistent within the drawing).
• Capacitor: two parallel lines (non-polarised) or one straight line plus one curved (polarised electrolytic).
• Inductor: a series of arches or a coil symbol.
• Diode: triangle pointing into a bar.
• Transistor: circle with three connections (emitter, base, collector) and direction-of-current arrow.
• Operational amplifier: triangle with positive and negative inputs and a single output.
• Ground: horizontal lines decreasing in length.
• Connection / no-connection at crossing wires: a dot indicates a junction; no dot indicates the wires cross without connection.

Schematic conventions: signal flow generally left-to-right; power supplies at the top, ground at the bottom; component values and reference designators next to each part.

Block diagrams

A block diagram abstracts a system into functional rectangles connected by arrows showing signal flow. Block diagrams are the right tool when:

• A schematic would have too many components to be readable.
• The intended audience is non-specialist.
• The design is at the architecture stage rather than the implementation stage.

Each block carries a clear functional label (e.g. "Low-noise amplifier", "ADC", "Channel encoder"). Arrows are labelled with the signal name and, where relevant, the data rate or signal level.

Data sheets

A data sheet is the manufacturer's technical specification for a component (transistor, op-amp, antenna, integrated circuit). HSC students should know how to read a data sheet:

• Maximum ratings. Voltages, currents, temperatures that must not be exceeded.
• Electrical characteristics. Typical and worst-case parameters at specified conditions.
• Application circuits. Suggested usage patterns.
• Mechanical drawings. Package dimensions, pin numbering.

A report that selects a component from a data sheet should cite the part number and the relevant parameter (e.g. "selected 2N3904 for the input buffer because the data sheet specifies hFE >= 100 at IC = 10 mA, satisfying the design requirement").

Examples in context

Example 1. A collaborative report on a small antenna design. A pair of HSC students design and test a quarter-wave monopole for a 433 MHz remote-control link. The collaborative report divides labour: one student handles the electromagnetic design (length, ground-plane size, expected radiation pattern) with calculations referencing standard antenna theory; the other handles the PCB layout and measurement (S11 return-loss measurement with a vector network analyser, if available, or a spectrum-analyser-based check). Both contribute to the evaluation and conclusion. The report meets NESA's collaborative requirement and demonstrates the team-engineering outcome (H5.1).

Example 2. An individual report on a fibre-optic transmitter PCB. A student designs a small PCB combining a microcontroller, an SFP fibre transceiver, and the requisite power supply and decoupling. The report includes a block diagram (microcontroller, encoder, SFP, power supply); the circuit schematic in IEC symbols; the PCB layout drawings to AS 1100.101 conventions; selected component data-sheet excerpts; and the test results. The same project would be infeasible without the drawing and circuit conventions to communicate the design clearly to the assessor and to peers who reviewed the work.

Try this

Q1. List five required components of a NESA engineering report. [5 marks]

• Cue. Any five of: aim; background research; method; calculations; technical drawings; results; evaluation / discussion; conclusion; references. Markers expect the student to know the report is more than a method-results pair.

Q2. Distinguish a block diagram from a circuit schematic, and identify a situation where each is the appropriate communication tool. [4 marks]

• Cue. Block diagram: rectangles labelled with function (LNA, mixer, ADC) connected by arrows; abstracts the architecture without component-level detail. Right tool for system overview, non-specialist audience, design-architecture stage. Circuit schematic: every component drawn with its IEC symbol, with reference designators and values; specifies the implementation. Right tool for assembly, debugging, and demonstrating that the design is realisable. A report on a complex system typically includes both: a block diagram up front, schematics in the detailed sections.

Q3. Describe the role of AS 1100 in engineering communication, and identify three specific conventions an HSC student must apply in a telecommunications-subsystem drawing. [6 marks]

• Cue. AS 1100 is the Australian Standard for technical drawing; it sets the conventions that make a drawing legible across organisations and over time. Three specific conventions: (1) First-angle orthographic projection with the appropriate symbol identifying the projection. (2) Line types distinguishing visible edges (thick continuous), hidden edges (dashed), and centrelines (chain). (3) Dimensioning in millimetres unless otherwise stated, with dimensions on the most informative view and arrows / leaders following the standard. Also acceptable: title block at bottom-right with drawing number, scale, drawn-by, date; lettering style; standard paper sizes (A4, A3, A2). The exam looks for evidence the student knows the conventions exist and can name specifics.