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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 is a specialized system that is associated with some other control system, which can take emergency action if a failure occurs.

Correct Answer: System to indicate not returning of the library book

Last Updated: February 04, 2019