Discussion
Statement I: Three units allow a failed unit to be identified, where two do not.
Statement II: Two units reveal that a disagreement exists but not which one is wrong.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Both Statement I and Statement II are correct
Both statements are correct, and together they explain why three units are fitted rather than two. With two units a comparator can show that the outputs disagree, but nothing in the data says which of them is at fault, so both must be treated as suspect.
With three, the faulty unit is the one that disagrees with both of the others, and median voting excludes it automatically while the system continues on the two that agree. This is the general principle of fault detection versus fault isolation: detecting an inconsistency needs two sources, isolating the culprit needs three.
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