What curve displays the power consumed at various output rates for airflow?

The Brake Power Curve is the correct choice because it specifically shows the relationship between the power consumed by a fan or ventilation system and the airflow it generates at different output rates. This curve illustrates how much power is required for various levels of airflow, which is crucial for understanding the efficiency and performance of ventilation systems in mining operations. By analyzing the Brake Power Curve, engineers can determine the operational efficiency of the system and make informed decisions about equipment selection and adjustments needed to optimize airflow while minimizing energy consumption.

In contrast, the other curves mentioned have different focuses. The Efficiency Curve typically represents the relationship between efficiency and airflow but does not specifically map power consumption. The Performance Curve offers a broader view of the fan's performance characteristics, including flow rate, total pressure, and static pressure, but it may not emphasize power consumption directly. The Flow Rate Curve usually relates to the volume of air moved but lacks the detail on power requirements. Therefore, the Brake Power Curve uniquely highlights the power aspect related to airflow output in ventilation systems.