S-12 Citywide Sprinkler Systems Practice Exam 2025 - Free Sprinkler Systems Practice Questions and Study Guide

When the pressure drop in a fire sprinkler system exceeds the capacity of the jockey pump, the fire pump is activated. The jockey pump is designed to maintain proper pressure within the system and is generally used to handle small fluctuations in pressure due to minor leaks or system demands. However, if the pressure drop surpasses what the jockey pump can manage, it indicates a more significant demand for water or a potentially larger issue, such as a noticeable leak.

In such situations, the fire pump, which is capable of delivering a much higher flow rate and pressure, automatically engages to meet the system's demands. The activation of the fire pump is crucial because it ensures that the necessary pressure and water supply are provided for effective firefighting, thereby maintaining the system's operational integrity in emergency scenarios. This mechanism is vital for safeguarding against fire risks, ensuring that the sprinkler system can perform adequately when needed.

Other options such as system shutdown, alarm activation, or the pressure stabilizing automatically do not address the need for immediate water supply and pressure management, which is critical in a fire emergency. The activation of the fire pump is the direct response mechanism to ensure that the system retains its intended function.