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What is called a quadruplex system?

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What is called a quadruplex system?

(a) System with 4  channels

(b) System with 8 channels

(c) System which does not fail

(d) System with 4 times the speed

The question was posed to me at a job interview.

My query is from Redundancy and Failure Survival in FBW topic in chapter Fly by Wire Flight Control of Avionics

1 Answer

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Correct answer is (a) System with 4  channels

Explanation: A well established redundant system comprises four totally independent channels of sensors and computers in a parallel arrangement to give the required failure survival capability – such a configuration is referred to as a quadruplex system.

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