Fluid Mechanics
Design of the casing of centrifugal pump should be such as to minimise the

Back flow through impeller
Loss of static head
None of these
Loss of kinetic head

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Fluid Mechanics
In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of

Relative roughness
All of these
Absolute roughness
Friction co-efficient for flows at equal Reynold number

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