Safety-Critical Systems CTEL-TM-SM Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   An avionics company is developing a cockpit display for pilots. The display shows critical flight data, and pilots must be able to interpret it quickly under high-stress conditions. The test team has completed functional testing of the display logic. What additional testing should the test manager prioritize to address operator interaction risks?

   • ARegression testing to ensure that recent changes to the display logic did not break existing functionality.
   • BPerformance testing to measure the display's frame rate under maximum data load.
   • CUsability testing with representative pilots in a simulated cockpit environment to assess readability and response time under stress.
   • DStatic analysis of the display rendering code to identify potential memory leaks.
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2. 17foundation · easy

   Which metric is most useful for measuring the completeness of safety requirement testing?

   • AThe total number of defects found during testing.
   • BThe number of test cases executed per day.
   • CThe percentage of test cases that were automated.
   • DRequirements coverage, which is the percentage of safety requirements that have at least one passing test case.
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4. 18application · medium

   A test team is considering automating regression tests for a SIL 2 medical device software. The team has a test automation framework that was previously used for a non-safety-critical project. The test manager must decide whether to reuse this framework. What is the most important consideration before reusing the framework?

   • AWhether the framework can generate test reports in a format that stakeholders prefer.
   • BWhether the framework supports the programming language used by the medical device software.
   • CWhether the framework is open source or commercially licensed.
   • DWhether the framework has been validated for use in a safety-critical context and its results are trustworthy.
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5. 19application · medium

   An automotive supplier is developing an electronic steering control unit that must comply with ISO 26262 at ASIL D. The team wants to use a commercial static analysis tool to detect coding defects early. The tool vendor provides a qualification kit that demonstrates the tool is suitable for use in a safety lifecycle. What is the primary reason the test manager should require this qualification kit before allowing the tool in the project?

   • ATo verify that the tool can integrate with the existing continuous integration pipeline.
   • BTo confirm the tool's output is trustworthy and that its use does not introduce undetected errors into the safety lifecycle.
   • CTo determine whether the tool can run on the team's existing hardware without performance degradation.
   • DTo ensure the tool vendor offers technical support during the project duration.
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6. 20application · medium

   A test manager is planning the test strategy for two subsystems of a process control system. Subsystem A is classified as SIL 2, and Subsystem B is classified as SIL 3. Both subsystems have similar functionality and complexity. How should the test manager differentiate the test approach for these subsystems?

   • AFocus testing only on Subsystem B and perform minimal testing on Subsystem A.
   • BUse the same test approach for both subsystems because they have similar functionality.
   • CApply more rigorous test techniques and higher coverage criteria to Subsystem B than to Subsystem A.
   • DTest Subsystem A more thoroughly because it is less critical and therefore needs more validation.
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