Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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How much oil is present in a rectangular oil gravity tank with dimensions of height 15", width 9", and length 10" when the oil level is 9" high?

  1. 2 gallons

  2. 3.5 gallons

  3. 4.5 gallons

  4. 5 gallons

The correct answer is: 3.5 gallons

To determine the amount of oil in the rectangular oil gravity tank, you first need to calculate the volume of oil present, which can be done using the formula for the volume of a rectangular prism: volume = length × width × height. In this scenario, the dimensions are: - Length = 10 inches - Width = 9 inches - Height of oil = 9 inches (the oil level) Plugging in these values, the calculation for the volume of oil in the tank is as follows: Volume = 10 in × 9 in × 9 in = 810 cubic inches. To convert cubic inches to gallons, you can use the conversion factor: 1 gallon = 231 cubic inches. Therefore, the calculation to convert from cubic inches to gallons is: Volume in gallons = Volume in cubic inches / 231. Now, substituting the volume we found: Volume in gallons = 810 in³ / 231 in³/gallon ≈ 3.5 gallons. Thus, the correct answer is that the tank contains approximately 3.5 gallons of oil when the oil level is 9 inches high. This demonstrates a clear understanding of how to calculate the volume of a fluid within a specific tank dimension and subsequently

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