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What type of system does the figure represent?

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What type of system does the figure represent?

(a) Monitored system

(b) Duplex system

(c) Monitored duplex system

(d) Monitored diplex system

I had been asked this question during a job interview.

Asked question is from Redundancy and Failure Survival in FBW in section Fly by Wire Flight Control of Avionics

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Correct choice is (c) Monitored duplex system

To explain: A monitored system uses signal monitors to identify error in the signal. If an error is identified the main signal is disconnected and the next channel takes over. Since there are two channels in the above system it is a monitored duplex system.

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