Drive power of the supercharger is calculated using boost pressure and which parameter?

• A. Volume
• B. Mass
• C. Airflow
• D. Temperature

Answer: (C)

Drive power for a supercharger depends on how much air the compressor moves and how much pressure rise it creates. The work (power) required to compress air increases with the boost pressure and with the amount of air flowing through per unit time. In practical terms, the input power is proportional to the boost (ΔP) times the volumetric airflow rate (Q), adjusted for efficiency. Temperature and volume alone don’t directly set the required work in the same straightforward way, since they mainly influence density and flow, but the key factor that combines with boost to determine drive power is the airflow. So the correct parameter is airflow.