TCFP Plans Examiner Practice Test

A coupled water motor-pump proportioner consists of two positive displacement pumps that are mounted on what?

1. Common Shaft

2. Single Base

3. Rotating Frame

4. Independent Stands

The correct answer is: Common Shaft

A coupled water motor-pump proportioner features two positive displacement pumps that are mounted on a common shaft. This design allows both pumps to operate synchronously, ensuring that they deliver water and foam at the correct ratio and pressure when activated. By using a common shaft, the mechanical linkage between the pumps minimizes the potential for operational discrepancies, enhancing efficiency and reliability. Furthermore, this configuration typically offers a more compact setup, reducing the overall footprint of the equipment compared to other mounting options. The importance of a common shaft also relates to the maintenance and alignment of the pumps, as they can be serviced as a single unit, which simplifies the process and reduces downtime. Such alignment is critical in ensuring that both pumps maintain their proportional output during operation, providing effective performance in firefighting and other applications requiring precise mixing of water and foam.