aircraft systemsFAA-published sample question (PAR, Aug 2021)
With regard to carburetor ice, float-type carburetor systems in comparison to fuel injection systems are generally considered to be
A
more susceptible to icing.✓ Correct Answer
B
equally susceptible to icing.
C
less susceptible to icing.
Explanation
In a float-type carburetor, fuel vaporization and the pressure drop in the venturi can cool the air below freezing, so ice can form even at moderate outside air temperatures. A fuel injection system has no venturi and injects fuel at or near the intake ports, so PHAK Ch. 7 describes it as less susceptible to icing than a carburetor system. Therefore carburetors are more, not equally or less, susceptible to icing.
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