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Communication, Navigation, Position And Warning Practice Test

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What quantity is accurately measured by a capacitance type fuel quantity indicating system?
Correct Answer:
The mass
Explanation:
The key idea is that capacitance type fuel quantity systems detect how much fuel is present by sensing fuel level in the tanks. The capacitance changes as the amount of fuel (the dielectric between the probes) changes, giving a measurement of the fuel height, which is then translated into volume. To get mass from this, you’d need to apply fuel density, but the sensor itself measures volume (fuel level). So the correct quantity measured directly by a capacitance type FQIS is volume (fuel level). Mass and weight would require an additional density or gravity-based conversion, and temperature is not the direct quantity being measured by this system.

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