Which of the following is not a Protection system ?
Correct answer: B. System to indicate not returning of the library book
- A. System to stop a train if it passes a red light
- B. System to indicate not returning of the library book
- C. System to shut down a reactor if temperature/pressure are too high
- D. None of the mentioned
Explanation
A protection system automatically prevents or limits a dangerous physical condition, as in stopping a train or shutting down a reactor. A library-book reminder or non-return indicator mainly records or reports a problem rather than protecting against a hazardous event.
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