Exam Question
(a) Describe what would be the indications of crank case explosion in main engine. (4)
(b) Describe actions to be taken, if there is crank case explosion in main engine. (8)
(c) Describe means of prevention of crank case explosion. (4)
Class 4 (4th Engineer)
MEP
📅 Jan 2025
Reference Answer
**(a) Indications of Crankcase Explosion in Main Engine (4 Marks)**
A crankcase explosion is a severe incident characterized by the rapid combustion of an oil mist-air mixture within the crankcase. The immediate indications of such an event are critical for rapid response and include:
* **Loud Report / Bang:** The most immediate and often startling indication is a distinct, sharp percussive sound caused by the rapid pressure rise and subsequent release of energy.
* **Operation of Crankcase Relief Valves (Explosion Doors):**
A crankcase explosion is a severe incident characterized by the rapid combustion of an oil mist-air mixture within the crankcase. The immediate indications of such an event are critical for rapid response and include:
* **Loud Report / Bang:** The most immediate and often startling indication is a distinct, sharp percussive sound caused by the rapid pressure rise and subsequent release of energy.
* **Operation of Crankcase Relief Valves (Explosion Doors):**
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