🔍 Key Concepts

• Eductor (jet pump) operation – identify the motive (working) fluid, the suction source, and the discharge destination on the diagram. • Flow paths in the lubricating oil circuit – trace the lines leaving the oil pump discharge and the lines connected to the inlet guide vanes drain sump and the main oil sump. • Difference between oil flow lines and refrigerant/gas lines in this chiller – look at where compressor discharge gas actually goes versus where lubricating oil is circulated.

💭 Think About

• On the illustration, which line clearly feeds into the eductor nozzle as a high‑pressure source? Does that line come from the oil pump discharge or from the compressor discharge? • From the eductor body, where does the mixed flow return—back toward the main lube oil sump or up toward the inlet guide vanes drain area? • Which component (main sump or inlet guide vanes drain sump) would logically need to be scavenged or drained by suction, and which one would be the natural place to return the collected oil to?

✅ Before You Answer

• Confirm the label and arrow direction on the line entering the eductor as the motive stream (oil vs gas). • Trace the suction connection from the eductor back to either the main lube oil sump or the inlet guide vanes drain sump—do not guess; follow the drawing. • Verify the discharge destination of the eductor by following the combined-flow line to its labeled end point before choosing among the answer options.