🔍 Key Concepts
• Pump characteristic curves – understand what each curve (H-Q, η-Q, P-Q) represents on the same set of axes
• Best Efficiency Point (BEP) – where the efficiency curve reaches its peak and how to read the corresponding capacity (GPM) and head (feet)
• Reading values from multi-axis graphs – matching a point on the capacity axis to both head, efficiency, and BHP on their respective scales
💭 Think About
• For each choice, locate the relevant point on the capacity axis (e.g., 900 GPM, 1600 GPM) and trace vertically to see what the graph actually shows for efficiency, head, and BHP at that flow
• Compare the head value at the labeled point of maximum efficiency with 160 feet: is the maximum efficiency occurring at that head or at a different one?
• At 1600 GPM, does the BHP curve line up closer to 60 HP, much higher, or much lower when read against the right-hand power scale?
✅ Before You Answer
• Be sure you convert capacity units correctly (the x-axis is in 100 GPM increments, not single GPM)
• Match each vertical line (for a given GPM) to all three curves: head, efficiency, and power, and then to the correct scale on the y-axis (left for head, right for efficiency and BHP)
• Confirm whether the labeled “point of maximum efficiency” matches the capacity and head claimed in any of the statements before deciding if more than one statement can be true