Which of the following statements is true...

🔍 Key Concepts

• Carefully locate the labeled Point of Maximum Efficiency on the pump characteristic curves • Understand that capacity (Q) is plotted on the bottom axis in hundreds of GPM, and total head (H) is on the left vertical axis in feet • Recognize that brake horsepower (BHP) and efficiency (%) each have their own curves and scales on the right side of the chart

💭 Think About

• From the Point of Maximum Efficiency, trace straight down to the Q-axis and convert the reading from ‘hundreds of GPM’ into actual GPM. Which choice matches that value most closely? • From the same point, trace horizontally to the left to find head in feet, and to the right to intersect the BHP curve. Do the approximate values you read agree with all three numerical statements, or is one clearly off? • Ask yourself: if even one of the three numerical statements does not match the graph at the Point of Maximum Efficiency, what does that tell you about option D

✅ Before You Answer

• Be sure you are reading Q in 100 GPM units, not in single GPM units • Verify that you are using the Point of Maximum Efficiency (where the efficiency curve peaks), not just the peak of the head or BHP curves • Double-check that your approximate head (ft), capacity (GPM), and BHP all come from the same vertical line through the Point of Maximum Efficiency before judging the answer choices

Which of the following statements is true concerning the pump characteristics shown in the illustration? See illustration GS-0138.

The pump discharge head when operating at maximum efficiency is approximately 132 feet

Operating the pump at maximum efficiency would require approximately 58 horsepower

The pump capacity would be approximately 1480 GPM when operating at maximum efficiency

All of the above

🔍 Key Concepts

💭 Think About

✅ Before You Answer