There are two types of floating roof tanks: Open-top and Covered Top.

There are two types of floating roof tanks: Open-top and Covered Top.

• A. Open-top and Covered Top
• B. Internal roof and External roof
• C. Fixed roof and Floating roof
• D. Dome top and Shielded top

Answer: (A)

The concept being tested is how floating roof tanks are classified by whether the roof is exposed or covered. An open-top floating roof sits on the liquid with no enclosing cover, allowing weather exposure but typically simpler operation and maintenance. A covered-top floating roof has a covering over the roof, which helps keep rain out and further reduces vapor losses. This distinction aligns with the option stating open-top and covered top as the two types. The other terms describe different tank features (like internal vs external or fixed vs floating) that aren’t the two categories being contrasted here.

The concept being tested is how floating roof tanks are classified by whether the roof is exposed or covered. An open-top floating roof sits on the liquid with no enclosing cover, allowing weather exposure but typically simpler operation and maintenance. A covered-top floating roof has a covering over the roof, which helps keep rain out and further reduces vapor losses. This distinction aligns with the option stating open-top and covered top as the two types. The other terms describe different tank features (like internal vs external or fixed vs floating) that aren’t the two categories being contrasted here.