Hydraulics and Fluid Mechanics in ME
Head developed by a centrifugal pump is

Proportional to speed of impeller
Proportional to diameter of impeller
Proportional to diameter and speed of impeller
None of these

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Hydraulics and Fluid Mechanics in ME
Surface tension

Acts in the plane of the interface normal to any line in the surface
Is a function of the curvature of the interface
Is also known as capillarity
Decreases with fall in temperature

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