Safety-Critical Systems CTEL-TM-SM Practice Questions (Page 7)

Questions 31–35

1. 31foundation · easy

   Why is it important to use a test environment that accurately represents the operational environment in safety-critical testing?

   • ATo allow testers to work from home.
   • BTo speed up the execution of test cases.
   • CTo reduce the cost of testing by using cheaper hardware.
   • DTo ensure that test results are valid for the real-world conditions in which the system will operate.
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2. 32foundation · easy

   What does a higher Safety Integrity Level (SIL) indicate about the required testing?

   • ATesting can be performed by any team member without special qualifications
   • BLess testing is needed because the system is designed to be safer
   • COnly black-box testing is allowed
   • DMore rigorous testing with a greater depth of analysis and coverage
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4. 33foundation · easy

   What is the primary purpose of fault injection testing in a safety-critical system?

   • ATo verify that the system can detect and safely handle faults without causing a hazardous situation.
   • BTo measure the performance of the system under normal operating conditions.
   • CTo identify which parts of the code are not executed during testing.
   • DTo test the system's user interface for usability issues.
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5. 34foundation · easy

   Which activity is an example of incorporating human factors into safety-critical testing?

   • ATesting the system with invalid input data to check error handling.
   • BMeasuring the response time of the system under load.
   • CConducting a usability test with operators to evaluate the clarity of alarm messages.
   • DPerforming a code review to check for syntax errors.
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6. 35application · medium

   A company is developing software for a home heating system. The software controls the boiler temperature and has a safety feature that shuts down the boiler if the temperature exceeds a safe limit. The company is debating whether this system should be classified as safety-critical. Which characteristic is most decisive in making this classification?

   • AThe complexity of the software code and the number of features it provides.
   • BThe number of users who will interact with the system.
   • CThe cost of the hardware components used in the system.
   • DThe potential for the software to cause harm to people or property if it fails.
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