Which of the following correctly describes the induction method of foam proportioning?

The induction method of foam proportioning is correctly described as utilizing an eductor to draft foam concentrate into the water stream. This process operates by creating a vacuum within the eductor, which draws foam concentrate from a storage container into the water flow, thoroughly mixing the two as they exit the nozzle. This method is efficient and ensures a well-dispersed foam solution, which is vital for effective fire suppression.

The eductor system is particularly advantageous because it allows for a continuous supply of foam while maintaining the necessary pressure in the water stream, making it ideal for use in firefighting scenarios where rapid deployment is crucial. It is widely employed in various firefighting applications due to its reliability and ease of operation.

The other methods mentioned, such as using a pump or manual mixing, do not accurately represent the induction method. A pump for forcing foam into a tank would indicate a different method of proportioning, while manual mixing is impractical in many fire scenarios where quick action is needed. Gravity mixing, although a possible technique in some contexts, does not describe the active mechanism of drawing foam into the water stream as effectively as the eductor method does.