FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

The incorrect options (B, C, D) each contain components that are not typically used in a fuel quantity indicating system, making them incorrect. For example, B includes a converter, which is used to convert electrical currents, but not typically used in a fuel quantity system. C includes a capacitor, which is a component used to store electrical energy, but not typically used in a fuel quantity system. D includes a generator, which is a device that converts mechanical energy into electrical energy, but not typically used in a fuel quantity system. Therefore, A is the best choice as it includes components that are commonly present in a fuel quantity indicating system such as a bridge circuit, an amplifier, an indicator, and a tank unit.