Fluid Mechanics
Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is

Q/8
Q/16
Q/4
Q/2

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Fluid Mechanics
Steady flow occurs, when the

Conditions do not change with time at any point
Conditions are the same at the adjacent points at any instant
Conditions change steadily with time
Rate of the velocity change is constant

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