What voltage and rotational speed measurement was observed from the inductive sensor in an automotive application?

In an automotive application, the inductive sensor is used to detect rotational speed by measuring the voltage generated as a result of the motion of metallic components, such as gears and crankshafts. The correct choice reflects a balance between the voltage output and the corresponding rotational speed typical for operational ranges of vehicles.

A measurement of 1.2 V at 3000 r.p.m. suggests a reasonable, expected output for an inductive sensor under those operating conditions. As the speed increases, the voltage produced by the sensor similarly increases, but the voltage levels and their association with speed need to stay within practical limits. The values in the correct option indicate a moderate operational speed and voltage that would align well with various automotive functions, such as engine speed sensing.

Higher voltages and speeds can indicate outputs that may be less common or may suggest peak operational thresholds, which could be less representative of typical functional ranges. Therefore, 1.2 V and 3000 r.p.m. is characteristic of a typical functioning scenario for an inductive sensor in automotive systems, making it a valid choice.