FAA AMT Airframe Practice Exam 2025 – All-in-One Study Guide to Master Aviation Maintenance Technician Certification!

Question: 1 / 1030

What is the dielectric (nonconducting material) in a capacitance type fuel quantity indicating system?

Fuel and air in the tank

In a capacitance type fuel quantity indicating system, the dielectric material is the nonconducting material between the conducting plates that allows for the measurement of the fuel level in the tank. A dielectric material such as fuel and air in the tank is used because it affects the capacitance of the system as the fuel level changes. This change in capacitance is then used to determine the quantity of fuel in the tank accurately. Therefore, option A is correct as it correctly identifies the dielectric material used in a capacitance type fuel quantity indicating system.

Options B, C, and D are incorrect because rubber, plastic, oil, water, nitrogen, and oxygen are conductive materials and are not typically used as dielectric materials in capacitance type fuel quantity indicating systems.

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Rubber and plastic in the tank

Oil and water in the tank

Nitrogen and oxygen in the tank

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