Discussion
Two dissimilar sensors are sometimes used for the same measurement to
Answer: D
Correct answer: Avoid a common mode failure affecting both
Two identical sensors share every design fault, every manufacturing batch defect and every susceptibility - to icing, to a particular contaminant, to a software error in a shared conversion routine. A cause that defeats one may defeat both at once, and the pair would then agree while both were wrong.
Dissimilar sensors, working on different physical principles, are unlikely to fail in the same way for the same reason. That is dissimilar redundancy, and it protects against the failure mode simple duplication cannot.
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