IEC 61508 Functional Safety Practice Test

The IEC 61508 Functional Safety Practice Test is a free advanced-level, 25-minute skill test from Science of Apps. Practice for IEC 61508 functional safety training and certification (such as TÜV FS Engineer) — the standard's structure and safety lifecycle, hazard and risk analysis with SIL determination, hardware safety integrity and reliability calculations, software and systematic capability, and functional safety management and sector standards — written to IEC 61508 (Edition 2) with IEC 61511 and related sector standards for 2026. Score 70% or more on its 25 questions to earn a verifiable Functional Safety IEC 61508 Readiness certificate (SOA-FSIE). Every question is based on published standards and research — including IEC 61508 Functional safety of electrical/electronic/programmable safety-related systems (IEC), IEC 61511 Functional safety: safety instrumented systems for the process industry sector (IEC), Center for Chemical Process Safety (AIChE) — and each answer is explained with its source.

Yes. Science of Apps has a free IEC 61508 Functional Safety Practice Test built on the current IEC exam outline for 2026 and 2027. It covers standard and safety lifecycle, hazard analysis and SIL determination, hardware integrity and reliability, software, systematic capability and management and operation, maintenance and proof testing, scores you instantly and issues a verifiable certificate.

Read the five skill areas on this page, then take the 25-minute test online — no fee, course or sign-up. You see every answer explained when you finish. Score 70% or more and you get a Functional Safety IEC 61508 Readiness certificate straight away, on screen, as a PDF and by email, with a credential ID anyone can verify.

Yes. The questions are original scenarios written by Science of Apps, and each one is based on a public source you can read: IEC 61508 Functional safety of electrical/electronic/programmable safety-related systems (IEC); IEC 61511 Functional safety: safety instrumented systems for the process industry sector (IEC); Center for Chemical Process Safety (AIChE). The source is shown under each question and linked in the answer review. Science of Apps doesn't copy questions from other tests.

Five skill areas with five questions each, drawn from a bank of 10 per area so a retake brings new questions: Standard and Safety Lifecycle (Structure, Lifecycle phases and Concepts); Hazard Analysis and SIL Determination (Risk assessment, SIL targets and Demand modes); Hardware Integrity and Reliability (PFD calculation, Architecture and Diagnostics); Software, Systematic Capability and Management (Software techniques, Systematic capability and FS management); Operation, Maintenance and Proof Testing (Proof tests, Maintenance and Operational records). Every question is an original scenario written to the 2026–2027 standard, with the published source named under it.

Functional safety engineer, Control and instrumentation engineer, Safety instrumented system designer, Process safety engineer and Safety assessor or auditor. It suits anyone who wants a quick, verifiable way to show IEC 61508 knowledge in 2026 and 2027, from students and career switchers to experienced professionals.

IEC 61508 is the international basic functional safety standard for electrical, electronic and programmable electronic safety-related systems. It defines the safety lifecycle and Safety Integrity Levels (SIL 1 to 4), and sector standards such as IEC 61511 (process), IEC 62061 (machinery) and ISO 26262 (automotive) are based on it.

For low-demand mode, each SIL corresponds to a range of average probability of failure on demand (PFDavg): SIL 1 from 10⁻² to 10⁻¹, SIL 2 from 10⁻³ to 10⁻², SIL 3 from 10⁻⁴ to 10⁻³ and SIL 4 from 10⁻⁵ to 10⁻⁴.

No. It is an independent practice test written to the publicly available IEC 61508 content outline for 2026 and 2027, for checking your readiness before you book the real exam. Passing earns a Science of Apps certificate rather than the official credential.

Yes. The test is online, in English and free everywhere — people take it from India, the US, the UK, Europe, Africa, Latin America and Asia-Pacific. Your certificate is dated with your own local date and can be verified from anywhere at scienceofapps.com/certification/verify/.

25 questions — 5 from each of 5 skill areas — with a 25-minute limit. You need 70% (18 of 25) to pass and 90% for distinction.

We rate it Advanced: assumes years in the role or deep specialist knowledge. It has 25 scenario questions — 5 from each of 5 skill areas — and a 25-minute limit. You need 70% (18 of 25) to pass and 90% for distinction.

Nothing. There is no fee to take a test, to receive the certificate, to have it emailed or to verify it, and no sign-up.

On our server, not in your browser. The answers never reach the page until you submit, so a certificate can only be earned by passing. Each certificate gets a unique credential ID stored by Science of Apps.

You see your score for each area and every question with the correct answer and why, with the published source behind it. You can retake after 30 minutes, and the retake draws questions you haven't seen yet.

No. Every certificate is dated, so it always shows when you passed. Retake a test any time for a newer date or a higher score.

Yes. After you pass, Add to LinkedIn opens the Licenses & certifications form with the certificate name, Science of Apps as the issuer, the issue date, your credential ID and the verification link filled in. You can also download it as a PDF or PNG, and it's emailed to you as a PDF.

Every certificate has a credential ID and a QR code. Scanning it, or entering the ID at scienceofapps.com/certification/verify/, shows the holder's name, the certification, the score and the issue date from our records.

No. They are Science of Apps' own assessments of applied skill. They aren't issued by a university or standards body, and they work best alongside a portfolio that shows the skills in real work.