Chemical Engineering MCQs

Page No. 150

The most economical flow control valve for use with large diameter pipes is a__________________?


aButterfly valve


bGlobe valve


cNeedle valve


dNone of these


View Answer Butterfly valve

The equivalent diameter for fluid flow through square cross section channel of side ‘x’, for pressure drop calculation purpose is given by____________________?


a4x


b2x


cx


d√x


View Answer x

Minimum fluidisation velocity for a specific system depends upon the___________________?


aParticle size


bFluid viscosity


cDensity of both the particle & the fluid


dAll A., B. and C.


View Answer All A., B. and C.

In case of a pipe of constant cross-sectional area, the maximum fluid velocity obtainable is___________________?


aThe velocity of sound


bDependent on its cross-sectional area


cDependent on fluid viscosity


dDependent on fluid density


View Answer The velocity of sound

Pressure drop for laminar fluid flow through a circular pipe is given by__________________?


a4f (L/D) (v2/2gc) ρ


b32 (μLV/gc D2)


c16/NRe


d(fLρ/D) (v2/2gc)


View Answer 32 (μLV/gc D2)

The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is___________________?


a4(Ro-Ri)


b√(Ro-Ri)


c2(Ro-Ri)


dRo + Ri


View Answer 2(Ro-Ri)

A pipe has a porous section of length L as shown in the figure. Velocity at the start of this section of V0. If fluid leaks into the pipe through the porous section at a volumetric rate per unit area q(x/L)2, what will be axial velocity in the pipe at any „x‟? Assume incompressible one dimensional flow i.e., no gradients in the radial direction ?


aVX = V0 + q (x3/L2D)


bVX = V0 + ⅓q (x3/L2)


cVX = V0 + 2q (x2/LD)


dVX = V0 + (4/3) q (x3/L2D)



Navier-Stokes equation is useful in the analysis of _____________ fluid flow problems?


aNon-viscous


bViscous


cTurbulent


dRotational


View Answer Viscous

The head loss in turbulent flow in a pipe varies_________________?


aDirectly as the velocity


bInversely as the square of the velocity


cApproximately as the square of the velocity


dInversely as the square of the diameter



The amount of heat required to decompose a compound into its elements is _____________ the heat of formation of that compound from its elements?


aLess than


b More than


cSame as


dNot related to


View Answer Same as

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