Fluid Mechanics MCQs

Pressure drop (Δp) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as

__________ pump is the most suitable device for discharging a liquid against a pressure of ≥ 1500 kgf/cm².

For laminar flow through a closed conduit

A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below :
Δ P/L = 375 x 10³ V_OM + 10.94 x 10⁶ V²_OM (SI units)
If water is to be used as the fluidising medium, the minimum fluidisation velocity, V_OM is

A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D. of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m³/s? The Fanning friction factor, f is 0.0062.

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

In a fully turbulent flow (Re > 10⁵) in a pipe of diameter 'd', for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is

A pressure head of 320 metres of water in meters of CCl₄ (sp.gr = 1.6) will be

Hydraulic mean depth (D_m) for a circular pipe of diameter 'D' flowing full is 0.25 D. For a circular channel, at D_m = 0.3 D, gives the condition for the maximum