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What are C 1, C 2, C 3, C 4 in the following diagram of the quadruplex system?

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What are C 1, C 2, C 3, C 4  in the following diagram of the quadruplex system?

(a) Computer

(b) Power control unit

(c) Monitor

(d) Blank box

This question was posed to me in examination.

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

1 Answer

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Best answer
The correct option is (a) Computer

Explanation: The signal from the lane passes through the voter and consolidator for cross comparison of signals. These signals are then passed on to the computer which applies control laws and calculates the amount of deflection required by the actuator. The signal passes through another set of voter and consolidator for errors before passing to on to the actuator.

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