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Class 4 (4th Engineer) MEP 📅 Oct 2022

Exam Question

Briefly explain the following;

(a) How would you know a Refrigeration System is Undercharged? (4)

(b) What should you do to ensure that there is no Water Leakage into the Engine Cylinder before preparing Main Engine for Sea? (6)

(c) What would cause the Level of the Lub Oil Sump of Main Engine or Drain Tank to Rise? (4)

(d) How can Exhaust Valve Leakage of Auxiliary Engine be confirmed? (2)

Reference Answer

### (a) How would you know a Refrigeration System is Undercharged? (4 Marks)
An undercharged refrigeration system has an insufficient mass of refrigerant to operate efficiently. The following symptoms and observations would confirm this condition:
1. **Visual Indication (Sight Glass)**:
* The primary and most immediate indicator is the presence of **large, continuous bubbles or flashing gas** in the liquid line sight glass when the compressor is running. A correctly charged system should show a solid, clear column of liquid refrigerant flowing to the expansion valve.

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