Oilers/Plant Tenders (HHC) Civil Service Practice Exam

What shape should the bottom of an overhead gravity supply oil tank be?

1. Flat

2. Conical

3. Rectangular

4. Cylindrical

The correct answer is: Conical

Choosing a conical shape for the bottom of an overhead gravity supply oil tank is the correct choice due to its functional advantages. A conical bottom allows for better drainage of the oil from the tank. This design facilitates the complete evacuation of the contents, minimizing the likelihood of residue build-up at the bottom. Efficient drainage is crucial for both maintenance and operational efficiency, as it helps prevent the accumulation of sludge and particulates, which can affect the quality of the oil and the performance of the system. In contrast, other shapes may not provide the same level of drainage effectiveness. A flat bottom might retain some liquid, leading to potential issues with residue accumulation. A rectangular design could also have similar issues with drainage inefficiencies. While a cylindrical tank is often used for the sides, it typically features a flat or rounded bottom which does not provide the same drainage advantages as a conical shape. Thus, the conical design is preferred in engineering practices for oil supply systems.