Functional Safety and Safety Culture CT-AUT Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   What role does testing evidence play in a safety case?

   • AIt replaces the need for hazard analysis
   • BIt provides objective proof that safety requirements have been met
   • CIt is optional if the design is considered safe
   • DIt is only needed for hardware, not software
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2. 7expert · medium

   A test engineer is responsible for testing a safety mechanism that detects a sensor failure and switches to a redundant sensor. During testing, the engineer finds that the mechanism works correctly in 95% of the fault injection tests, but fails in 5% of cases. The engineer is under pressure to release the software. What is the most appropriate action for the test engineer to take?

   • AReport the 5% failure rate to the safety manager and recommend that the software not be released until the failures are analyzed.
   • BDocument the 5% failure rate but proceed with the release because the mechanism works most of the time.
   • CRe-run the tests until all pass, and then report the results.
   • DIgnore the 5% failure rate because the safety mechanism is a secondary feature.
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4. 8application · medium

   A tester on a functional safety team discovers that a test case for a critical safety requirement was not executed because of a test environment issue. The tester decides to mark the test as 'passed' based on a similar test that was executed earlier. Which action is most aligned with the tester's responsibility in a safety culture?

   • ADelete the test case from the test plan to avoid a gap in the traceability matrix.
   • BReport the unexecuted test and the environment issue to the test lead, and request guidance on how to proceed.
   • CMark the test as 'passed' and note in the comments that it was based on a similar previous test.
   • DRe-run the similar test and use its result as the official evidence for the safety requirement.
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5. 9expert · medium

   A safety requirement states: 'The lane departure warning system shall issue a warning within 200 ms of detecting an unintended lane departure.' The test team is designing test cases. Which test case is most effective in verifying this requirement?

   • ACheck that the warning sound is loud enough to be heard.
   • BTest the system's ability to detect lane markings under various lighting conditions.
   • CSimulate an unintended lane departure and measure the time from the departure event to the issuance of the warning.
   • DVerify that the warning is issued when the driver uses the turn signal.
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6. 10expert · medium

   A company is developing a steer-by-wire system and is at the end of the product development phase. The safety manager is preparing for the safety validation activities. Which activity is most appropriate to perform during safety validation, as defined by ISO 26262?

   • AReview the hardware schematics to ensure they meet the ASIL requirements.
   • BConduct vehicle-level tests to confirm that the safety goals are achieved in the target vehicle environment.
   • CPerform unit-level tests on each software function to verify the code.
   • DUpdate the safety case with the results of the software integration tests.
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