Question 25 QMED01 - Junior Engineer

The Correct Answer is A. **Explanation for Option A (Diesel Oil Service Tank):** The Diesel Oil Service Tank (also commonly known as the Day Tank) is the tank located closest to the point of consumption (the engine or generator). Its primary function is to store a ready supply of clean, filtered fuel necessary for immediate operation. For an emergency generator, this service tank ensures that if the main fuel supply system fails, there is still enough fuel on hand to run the generator for a defined period (e.g., 24 hours). Therefore, the emergency generator draws its fuel directly from the Diesel Oil Service Tank. **Explanation for Incorrect Options:** **B) Diesel Oil Settling Tank:** The Settling Tank is used primarily for purifying the fuel. Bulk fuel is transferred here to allow water and heavy impurities to separate out by gravity before the fuel is processed further or transferred to the Service Tank. It is not the tank that directly supplies the generator. **C) Diesel Oil Boiler Tank:** This term is not standard in diesel fuel handling systems for generators. Boilers typically use their own specific fuel tanks (if oil-fired), but they do not supply fuel to the emergency generator. The emergency generator only requires diesel fuel for its engine. **D) Diesel Oil Booster Tank:** The term "Booster Tank" is not a standard designation for a tank in this fuel system. A "booster pump" may be used to increase pressure, but a "booster tank" does not fit the functional role of the final supply reservoir for an emergency generator.