Fluid Mechanics
The most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a

Pitot tube
Kennison nozzle
Weir
V-notch

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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

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

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