Safety-Related Systems CTAL-TTA Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   A project manager for an IEC 61508 SIL 1 system proposes using the same testing rigor as a SIL 3 system to be 'extra safe.' The Technical Test Analyst should respond that:

   • AThis is required because SIL 1 systems are more likely to fail.
   • BThis is not appropriate because testing rigor should be proportional to the SIL level, and over-testing can introduce unnecessary cost and delay.
   • CThis is acceptable because the standard does not specify different rigor levels.
   • DThis is acceptable because more testing is always better.
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2. 12foundation · medium

   Why is the role of a safety-related system important in software testing?

   • AIt determines the level of testing rigor required based on the potential consequences of failure.
   • BIt mandates the use of automated testing tools for all test cases.
   • CIt ensures that the system will never fail under any circumstances.
   • DIt requires that all testing be performed by an independent third-party organization.
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4. 13application · medium

   During a project for an IEC 61508 SIL 3 system, a developer claims that a test is a validation activity because it checks that the system meets the customer's needs. The Technical Test Analyst disagrees. Which statement best distinguishes validation from verification in this context?

   • AVerification checks that the system meets the customer's needs, while validation checks the implementation against the design.
   • BVerification is performed only by developers, while validation is performed only by testers.
   • CValidation checks that the system meets the customer's needs, while verification checks that the system meets its specified requirements.
   • DValidation is a one-time activity at the end of the project, while verification is continuous.
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5. 14foundation · medium

   In risk-based testing for safety-related systems, what is the primary factor that determines the priority of test execution?

   • AThe likelihood and impact of potential failures on system safety.
   • BThe availability of test automation tools.
   • CThe preference of the test team lead.
   • DThe order in which the test cases were written.
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6. 15foundation · medium

   Which statement best defines a safety-related system in the context of software testing?

   • AA system that has been certified by an external authority as safe for public use.
   • BA system whose failure could result in death, injury, or damage to health, the environment, or property.
   • CA system that contains redundant hardware components to ensure high availability.
   • DA system that is used exclusively in the healthcare industry and must comply with medical device regulations.
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