Fluid Mechanics
While starting a centrifugal pump, its delivery valve should be kept

Closed
Either opened or closed ; it does not make any difference
Either opened or closed; depending on the fluid viscosity
Opened

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Fluid Mechanics
A differential pressure cell is used for

Measuring the difference of the impact & the static pressure
Remote recording of pressure difference
Measuring small pressure difference in liquids
Measuring small pressure difference in gases

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

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