Question 196Refrigeration & AC - Assistant Engineer

The correct answer is A) The gauge labeled "A" is a compound gauge and is usually color-coded blue. Compound gauges measure both pressure and vacuum and are typically color-coded blue to distinguish them from standard pressure gauges, which are usually color-coded red. The gauge labeled "A" in the illustration GS-RA-01 is a compound gauge, which can measure both positive and negative pressure, and is therefore the correct choice. The other options are incorrect because B) a compound gauge is not usually color-coded red, C) a standard pressure gauge is not usually color-coded blue, and D) the gauge labeled "A" is a compound gauge, not a standard pressure gauge.