What is true about the size of external fuel tanks?

• A. They only come in one standard size
• B. They vary in size but typically hold 150, 300, or 400 gallons
• C. They are not used in aviation
• D. They are capable of holding unlimited fuel capacity

Answer: (B)

The statement about the size of external fuel tanks being variable, typically holding 150, 300, or 400 gallons, accurately reflects the design and functionality of these tanks in aviation. External fuel tanks are designed to enhance the range of aircraft by providing additional fuel capacity beyond what is available in the internal tanks. The sizes mentioned—150, 300, and 400 gallons—are common configurations that allow for flexibility in how much additional fuel can be carried based on mission requirements or aircraft capacity.

This variability in size is crucial for optimizing the performance of the aircraft in different operational contexts. Different aircraft types may utilize different tank sizes depending on their design and intended use, therefore providing options that can be tailored to specific missions.

While other options suggest a lack of variety or incorrect uses of the tanks, they do not accurately reflect the true nature and application of external fuel tanks in aviation.