Fluid Mechanics
Bed pressure drop in an air fluidised bed of catalyst particles (ρp = 200 kg/m³, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is

90
60
45
30

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Fluid Mechanics
Shear stress in a fluid flowing in a round pipe

Varies parabolically across the cross-section
Remains constant over the cross-section
Is zero at the wall and increases linearly to the centre
Is zero at the centre and varies linearly with the radius

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