Differences Between Closed-Loop and Open-Loop CT-AUT Practice Questions (Page 3)

Questions 11–15

1. 11expert · hard

   A test manager is planning tests for a new airbag control unit. The unit triggers deployment based on crash sensor signals. The deployment does not affect the crash sensor signals. The team has a very tight deadline and must ensure the unit's logic is correct for a wide range of crash scenarios. Which approach should they use, and what is the main advantage?

   • AClosed-loop testing, because it is required for all safety-critical systems.
   • BOpen-loop testing, because it allows rapid execution of many predefined crash scenarios with deterministic results.
   • CClosed-loop testing, because it provides the highest fidelity to real crashes.
   • DOpen-loop testing, but it cannot verify the deployment logic because there is no feedback.
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2. 12foundation · easy

   Which of the following is a key difference between closed-loop and open-loop testing?

   • AClosed-loop testing is simpler to set up, while open-loop testing is more complex.
   • BClosed-loop testing provides higher realism, while open-loop testing provides more control over test conditions.
   • CClosed-loop testing uses predefined inputs, while open-loop testing uses real-time feedback.
   • DOpen-loop testing is used for control systems, while closed-loop testing is used for individual components.
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4. 13foundation · easy

   In closed-loop testing, what is the key characteristic of the simulation environment?

   • AIt responds in real time to the system under test's outputs.
   • BIt is independent of the system under test's behavior.
   • CIt is static and does not change during the test.
   • DIt is only used for testing hardware components.
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5. 14expert · hard

   A test engineer is responsible for testing a tire pressure monitoring system (TPMS) that warns the driver when pressure is low. The system's warning does not affect the tire pressure. The engineer needs to verify that the warning is issued at the correct threshold and that no warning is issued above the threshold. Which testing approach should be used, and how does it affect test execution?

   • AOpen-loop testing, but it cannot verify the threshold because the pressure is not affected by the warning.
   • BOpen-loop testing, because it allows direct verification of the threshold by setting predefined pressure values.
   • CClosed-loop testing, because it is required for all warning systems.
   • DClosed-loop testing, because it allows simulation of the tire pressure dynamics.
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6. 15foundation · easy

   How does the choice between closed-loop and open-loop testing affect test case design?

   • AClosed-loop test cases are designed without considering the system's outputs.
   • BOpen-loop test cases focus on defining precise input sequences, while closed-loop test cases focus on defining realistic scenarios.
   • CClosed-loop test cases are typically simpler to design because they do not require a simulation model.
   • DBoth approaches require the same test case design effort.
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