Safety-Critical Systems CTEL-TM-SM Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   Which characteristic is most typical of a safety-critical system?

   • AThe system has a high degree of fault tolerance and includes redundant safety mechanisms.
   • BThe system is designed to maximize throughput and minimize response time.
   • CThe system is designed to be easily upgradeable with minimal downtime.
   • DThe system is developed using an agile methodology with frequent releases.
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2. 7foundation · easy

   Which of the following best defines a safety-critical system?

   • AA system that is used in a regulated industry, such as finance or healthcare.
   • BA system that is essential for the daily operation of a business, such as an email server.
   • CA system that handles sensitive data and requires strict access controls.
   • DA system whose failure could result in death, injury, or significant environmental or property damage.
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4. 8application · medium

   A test team is designing tests for a chemical plant's emergency shutdown system. The system has a temperature sensor that triggers a shutdown if the temperature exceeds 100°C. The system must also handle sensor values that are below -50°C or above 250°C, which are considered out of range. Which test technique is most appropriate for validating the temperature threshold logic?

   • AEquivalence partitioning with one value from each valid and invalid range.
   • BExploratory testing to discover unexpected behavior at various temperatures.
   • CState transition testing to verify the system moves from 'normal' to 'shutdown' state.
   • DBoundary value analysis focusing on temperatures around 100°C, -50°C, and 250°C.
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5. 9foundation · easy

   What is a key benefit of using simulation in safety-critical testing?

   • AIt guarantees that the system will work correctly in the real environment.
   • BIt allows testing of scenarios that are too dangerous, expensive, or impossible to test in the real environment.
   • CIt reduces the need for test documentation.
   • DIt eliminates the need for any real-world testing.
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6. 10expert · hard

   A test team is developing automated tests for a SIL 3 automotive system. The team wants to use a test automation tool that was developed in-house and has been used on several non-safety projects. The tool has a known defect that occasionally produces false-negative results (missing real failures). The test manager must decide whether to use this tool for the SIL 3 project. What is the most appropriate decision?

   • AUse the tool but increase the number of test cases to compensate for the defect.
   • BUse the tool only for non-critical test cases and manually test all safety-critical scenarios.
   • CDo not use the tool for the SIL 3 project because the known defect could cause safety-critical failures to be missed.
   • DUse the tool and document the defect as a known limitation in the test report.
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