Which component is essential to an electrical type fuel quantity indicating system?

An electrical type fuel quantity indicating system relies on a float operated transmitter installed in the tank to accurately measure the fuel level. This component is crucial because it converts the mechanical movement of the float, which rises and falls with the fuel level, into an electrical signal. This signal is then sent to the cockpit gauge, allowing the pilot to read the fuel quantity visually.

The float operated transmitter typically consists of a float, a rod, and a potentiometer or similar sensor that translates the float's position into a corresponding electrical resistance or voltage. As the float moves with changes in fuel level, the system adjusts the output signal, keeping the pilot informed of the fuel status throughout the flight.

This understanding of the float operated transmitter's role in the system highlights its importance and explains why selecting it as the correct answer is justified.