Incorporated Engineer (IEng) Knowledge and Understanding (UK-SPEC Competence A) Flashcards

24 sample cards from the Knowledge and Understanding (UK-SPEC Competence A) deck

Sampled from the end of the deck, so these are different cards from the ones shown on the syllabus page.

1. Distinguish accuracy from precision in measurement.

   Accuracy is closeness of a reading to the true value; precision is the repeatability/closeness of repeated readings to each other. A device can be precise but inaccurate.

2. Define 'resolution' of a measuring instrument.

   The smallest change in the measured quantity that the instrument can detect or display — the finest discernible increment of its output.

3. Define 'sensitivity' of a measurement system.

   The ratio of change in output to the change in input that produced it: $$S = \frac{\Delta \text{output}}{\Delta \text{input}}$$ — i.e. the slope of the calibration curve.

4. What is the difference between a systematic error and a random error?

   Systematic errors are consistent, repeatable biases (e.g. zero offset) that shift readings the same way; random errors scatter readings unpredictably and are reduced by averaging repeats.

5. What is 'traceability' in metrology?

   An unbroken chain of documented calibrations, each with stated uncertainty, linking a measurement back to recognised national or international (SI) standards.

6. Define instrument 'hysteresis'.

   The difference in output for the same input depending on whether the input is increasing or decreasing — the instrument's output lags its history.

7. What does the 'span' (or range) of an instrument describe?

   The interval between the minimum and maximum values the instrument is designed to measure; span = upper range limit − lower range limit.

8. Define 'drift' in an instrument and why calibration intervals address it.

   Drift is a gradual change in output over time for an unchanged input; periodic recalibration detects and corrects drift to keep readings within tolerance.

9. What is the role of codes, standards and specifications as engineering reference?

   They codify accepted good practice, minimum performance, safety and interoperability requirements, giving engineers a reusable, authoritative basis for design, manufacture and verification.

10. Distinguish a 'standard' from a 'specification'.

    A standard is a published, consensus document of agreed requirements/best practice (often national/international); a specification is a detailed statement of requirements for a particular product, project or contract.

11. What is the difference between a 'code of practice' and a mandatory regulation?

    A code of practice gives recommended guidance ('should') representing good practice; a regulation is legally enforceable ('shall/must'). Following a code can demonstrate compliance with the law.

12. Name the bodies behind BS, EN and ISO standards.

    BS — British Standards Institution (BSI); EN — European Committee for Standardization (CEN/CENELEC); ISO — International Organization for Standardization.

13. What is the significance of a harmonised 'BS EN ISO' designation?

    It indicates an International (ISO) standard adopted as a European (EN) standard and published nationally by BSI as a British Standard — a single document with multi-level recognition.

14. Why should engineers always work to the current edition of a standard?

    Standards are periodically revised to reflect new knowledge, technology, safety lessons and regulation; using a superseded edition risks non-compliance and outdated, unsafe practice.

15. State Ohm's law, a fundamental underpinning electrical principle.

    $$V = IR$$ where $V$ is voltage (V), $I$ is current (A) and $R$ is resistance (Ω).

16. State the formula for electrical power dissipated in a resistor.

    $$P = VI = I^{2}R = \frac{V^{2}}{R}$$

17. State Newton's second law of motion.

    The net force equals mass times acceleration: $$\vec{F} = m\vec{a}$$

18. State the definition of mechanical (axial) stress.

    Stress is force per unit cross-sectional area: $$\sigma = \frac{F}{A}$$ with SI unit pascal (Pa = N/m²).

19. State Hooke's law relating stress and strain in the elastic region.

    Stress is proportional to strain via Young's modulus $E$: $$\sigma = E\,\varepsilon$$ where $\varepsilon = \frac{\Delta L}{L_0}$.

20. Give the steady-state heat conduction relationship (Fourier's law, 1-D).

    $$Q = -kA\frac{dT}{dx}$$ where $k$ is thermal conductivity, $A$ the area and $\frac{dT}{dx}$ the temperature gradient.

21. What does a dimensional analysis check confirm about an engineering equation?

    That the equation is dimensionally homogeneous — both sides have identical units — a quick judgement test that a derived formula is plausibly correct.

22. What is a 'safety factor' (factor of safety) and how is it defined?

    A margin against failure given by $$\text{FoS} = \frac{\text{material/design strength}}{\text{actual applied load or stress}}$$ accounting for uncertainty in loads, properties and analysis.

23. How does an IEng combine quantitative analysis with engineering judgement when model results conflict with experience?

    By critically appraising the model's assumptions, input data quality and limitations, cross-checking against measurements, standards and physical reasoning, and not accepting outputs uncritically before deciding.

24. What is meant by keeping competence 'current', and which UK-SPEC competence underpins this obligation across a career?

    Maintaining up-to-date knowledge and skills as technology, tools and standards evolve, principally through ongoing CPD — an explicit, continuing obligation of registered engineers.

What this deck covers

Knowledge and Understanding (UK-SPEC Competence A) flashcards FAQ