🔍 Key Concepts

• multistage centrifugal pump vs single-stage pump construction • how impellers and stages are arranged to increase pressure (head) • difference between changing pressure (head) and changing only velocity in a pump

💭 Think About

• Which choice actually shows more than one "stage" doing work on the liquid, one after another, to build up pressure? • In a real multistage centrifugal pump, what is multiplied from stage to stage: pressure (head) or just velocity? • Look at how the impellers and casing are arranged in each option—does the description sound like multiple distinct stages, or just one impeller with a different casing shape?

✅ Before You Answer

• Make sure the option you pick clearly involves more than one impeller or stage doing work on the fluid in series. • Eliminate any choice that suggests the liquid loses pressure as it passes through stages—multistage pumps are used to increase head (pressure). • Check that the casing description matches a realistic pump design; avoid choices that sound like they would cause excessive leakage or inefficiency, not higher pressure.