Fluid Mechanics
With increase in the ratio of orifice diameter to pipe diameter in case of an orificemeter, the overall pressure loss

Remains constant
Increases
Decreases
Increases linearly

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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

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

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