A comparator in the EFIS system:

Adjusts display brightness

Compares engine parameters

Compares fuel quantity readings

Compares data from multiple sources (e.g., dual ADCs) and alerts if they disagree

Correct

Explanation

Comparators check data from redundant sources; if discrepancies exceed limits, they generate a warning (e.g., IAS DISAGREE).

Test yourself with random questions from Instrumentation and all other ATPL subjects.