For geometrically similar centrifugal pumps operating at the same speed, which quantity generally increases with impeller diameter?
Correct answer: B. Both discharge and head
- A. Pump discharge only
- B. Both discharge and head
- C. Pump head only
- D. Neither discharge nor head
Explanation
The pump affinity relationships indicate that discharge varies approximately with impeller diameter squared, while head varies approximately with its square. Therefore, both discharge and head generally increase as impeller diameter increases at constant speed.
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Hydraulics studies fluid properties, pressure, buoyancy, continuity, Bernoulli's equation, momentum, pipe flow, open-channel flow and hydraulic machines. Water resources extends these principles to pumps, turbines, reservoirs, irrigation, floods and hydrology, while distinguishing laminar from turbulent flow and uniform from gradually varied channel flow.
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