Fluid Mechanics MCQs

Which of the following relationship is valid for the equilibrium position of the float in a rotameter? (where, D_f = Drag force on the float B_f = Buoyant force on the float W_f = Weight of the float)

Deformation drag, which is caused by widespread deformation of fluid around the immersed body

A gas (density = 1.5 kg/m³, viscosity = 2 × 10^-5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5 kg/m³ and viscosity of 3 × 10^-5 kg/m.s flowing at 3 m/s will be

The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is

What is the shear rate at the pipe wall, in case of laminar flow of Newtonion fluids in a pipe of diameter 'D' & length 'L' incurring a pressure drop 'Δp' with average velocity 'V_avg'?

U_mf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 U_mf to 2.5 U_mf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the

Power required by a centrifugal pump is proportional to (where, D = diameter, N = r.p.m)

One stoke (unit of kinematic viscosity) is equivalent to

The dimension of surface tension is