Class 4 (4th Engineer) MEKG 📅 Mar 2026

Exam Question

(a) Explain 'shortcycling' in the context of refrigeration and airconditioning systems on board ship. State its causes and how it can be avoided. (6)

(b) State the symptoms of 'overcharging' and 'undercharging' in refrigeration system; what are its effects and state remedial measures. (5)

Reference Answer

### (a) Short Cycling in Refrigeration Systems
**Definition:**
'Short cycling' is a condition in a refrigeration or air-conditioning system where the compressor starts and stops with abnormally high frequency. Instead of completing a full, extended running cycle to bring the refrigerated space to the desired temperature, the compressor runs for a very short period, shuts down, and then restarts shortly after. This rapid, repeated cycling leads to increased energy consumption, excessive wear and tear on the compressor motor, contactors, and starting gear, and ultimately reduces the operational lifespan of the equipment.
**Causes of Short Cycling:**

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