Which of the following is not a Protection system ?(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 mentionedI had been asked this question in an international level competition.I'd like to ask this question from Dependability Engineering in section Dependability and Security of Software Engineering

Which of the following is not a Protection system ?(a) System to stop

1.	Which of the following is not a Protection system ?(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 mentionedI had been asked this question in an international level competition.I'd like to ask this question from Dependability Engineering in section Dependability and Security of Software Engineering
Answer» The CORRECT choice is (b) System to indicate not returning of the LIBRARY book Explanation: A Protection system is a specialized system that is associated with some other control system, which can TAKE EMERGENCY ACTION if a failure occurs.

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