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Class 4 (4th Engineer) MEP 📅 Apr 2025

Exam Question

Briefly explain the following:

(a) How would you know if 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? (4) 

(c) What could be the probable cause of a rise in the level of the lub oil sump tank of a main engine? (4) 

(d) How does the valve rotator as fitted on an exhaust valve of aux. engine work? (4) 

Reference Answer

### (a) How would you know if a refrigeration system is 'undercharged'?
An undercharged refrigeration system indicates an insufficient amount of refrigerant within the closed loop, leading to a reduction in its cooling capacity and manifesting several discernible symptoms across various components:
* **Compressor Behaviour:**
* **Continuous Running:** The compressor will run for unusually long periods or even continuously in an attempt to reach the setpoint temperature, which it often fails to achieve.

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