Fluid Mechanics - Chemical Engineering Questions and Answers

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Mach number is important in a fluid flow problem, when the inertia and __________ forces predominate.

elastic

viscous

gravity

none of these

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Fanning friction factor is equal to(where, f_B = Blassius friction factor).

f_B/4

f_B/2

4f_B

2f_B

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In case of coutte flow, the fluid flow is between two large flat parallel plates with

top plate moving and the bottom plate fixed.

bottom plate moving and the top plate fixed.

both the plates fixed.

both the plates moving.

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In a stabilised soap bubble, pressure inside it compared to external pressure is

less

same

unpredictable

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The component of acceleration resulting due to unsteady nature of flow is called __________ acceleration.

normal

local

convective

tangential

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Power required for mixing Newtonion fluids is a function of the

speed of impeller, diameter of impeller & viscosity.

density & viscosity of fluid only.

density of fluid, viscosity of fluid & impeller dia only.

none of these.

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Multistage compressors are used in industry, because they

reduce the cost of compressor.

reduce the size requirement,

resemble closely to isothermal compression.

are easy to control.

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The hydrodynamic and thermal boundary layers will merge, when

Prandtl number is one.

Schmidt number tends to infinity.

Nusselt number tends to infinity.

Archimedes number is greater than 10000.

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Differential manometer measures the

atmospheric pressure.

sub-atmospheric pressure.

pressure difference between two points.

none of these.