🔍 Key Concepts

• Pneumatic schematic symbols for filters, lubricators, and coolers • Purpose of control air conditioning before it reaches the air control reservoir • Difference between removing all moisture vs removing most contaminants (particles, oil, some water)

💭 Think About

• Look at the shape and internal line pattern of symbol "B" and compare it to standard pneumatic symbols for a filter, lubricator, or cooler: which one matches best? • Think about what treatment the air needs before going to a pressure-reducing/controlling system: what is the first thing you generally do to compressed air coming from a high‑pressure reservoir? • Which of the answer choices describes a realistic capability of a single in‑line device of this type, and which sound too perfect or like a different kind of component?

✅ Before You Answer

• Confirm whether symbol "B" shows a reservoir with cooling surfaces, a filter element, or a lubricant feed, based on its geometry. • Ask yourself if typical shipboard control-air filters can truly remove all moisture, or if they are designed mainly to remove solid particles and much of the liquid water/oil. • Verify that the function you pick would logically come before the pressure gauge and the 7‑bar air control reservoir in a control air pressure‑reducing unit.