aircraft systemsFAA-published sample question (AGI, Aug 2021)
The purpose of the heat exchange coil as used in hot air balloons is to
A
prevent ice from forming in the fuel lines.
B
warm the fuel tanks for more efficient fuel flow.
C
vaporize the fuel for more efficient burner operation.✓ Correct Answer
Explanation
In a hot air balloon burner, liquid propane passes through the heat exchange (vaporizing) coil above the flame, where it is heated and vaporized so it burns efficiently. The coil is not for heating the tanks or preventing ice in the lines.
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