Chemical Engineering MCQs

Page No. 150

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


aButterfly valve

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bGlobe valve

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cNeedle valve

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dNone of these

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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

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b2x

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cx

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d√x

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View Answer x

Minimum fluidisation velocity for a specific system depends upon the___________________?


aParticle size

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bFluid viscosity

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cDensity of both the particle & the fluid

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dAll A., B. and C.

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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

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bDependent on its cross-sectional area

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cDependent on fluid viscosity

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dDependent on fluid density

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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

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b32 (μLV/gc D2)

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c16/NRe

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d(fLρ/D) (v2/2gc)

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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)

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b√(Ro-Ri)

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c2(Ro-Ri)

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dRo + Ri

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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)

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bVX = V0 + ⅓q (x3/L2)

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cVX = V0 + 2q (x2/LD)

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

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


aNon-viscous

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bViscous

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cTurbulent

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dRotational

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View Answer Viscous

The head loss in turbulent flow in a pipe varies_________________?


aDirectly as the velocity

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bInversely as the square of the velocity

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cApproximately as the square of the velocity

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dInversely as the square of the diameter

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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

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b More than

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cSame as

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dNot related to

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View Answer Same as

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