Which signal form from a transmitter is an example of an electronic signal?

The choice of electronic analog as the correct answer is based on the nature of signal transmission in instrumentation. Electronic signals are typically represented in two forms: current and voltage. An electronic analog signal refers to a continuous representation of data that varies in time, which is characterized by its analog properties, such as smooth transitions between values, rather than discrete steps.

In industrial applications, electronic analog signals are often used for process control because they can provide more precise and responsive measurements compared to other forms of signal transmission. They leverage electrical parameters like voltage or current to convey information about physical measurements, such as temperature, pressure, or flow rate. This method allows for easier integration with modern control systems and instrumentation that require electronic interfacing.

Other types of signals that are mentioned in the context, such as pneumatic or pneumatic analog signals, utilize air pressure to communicate information, and are not classified as electronic signals. Therefore, electronic analog stands out distinctly as it conforms to the electrical characteristics needed in many automated systems, making it the correct answer.