Chemical Engineering MCQs

Page No. 169

If in a flow field, between any two points, then the flow must be___________________?


aSteady, incompressible, irrotational


bSteady, compressible, irrotational


cSteady, compressible and along a streamline


dUnsteady, incompressible, irrotational



Characteristic curves for a centrifugal pump plotted against its capacity is shown in the diagram. x, y and z denote respectively_______________?


aEfficiency, head and B.H.P.


bHead, efficiency and B.H.P.


cB.H.P., efficiency and head


dEfficiency, B.H.P. and head



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/m3and viscosity of 3 × 10‒5kg/m.s flowing at 3 m/s will be________________?


a8400 Pa/m


b12600 Pa/m


c18900 Pa/m


d16800 Pa/m


View Answer 12600 Pa/m

Cd is always ______________ Cc?


aGreater than


bLess than


cEqual to


dEither more or less than


View Answer Greater than

Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation ?


aDecrease in effect


bIncrease in thrust


cDevelops noise


dDevelops high pressure



For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance ‘d’ measured from the wall of the pipe and the friction velocity ‘v’, and it follows a _____________ relationship?


aLogarithmic


bLinear


cHyperbolic


dParabolic


View Answer Logarithmic

In case of a Rotameter, the density of the float material is _____________ that of the liquid it replaces?


aMore than


bLess than


cEqual to


dEither A. or B.


View Answer More than

For the manometer set up shown in the figure, the pressure difference PA – PB is given by_________________?


a(ρH – ρair)gH


b(ρH – ρL)gH


c(ρH – ρL) gH + (ρL – ρair) . g(L – H)


d(ρH – ρL) gL + (ρL – ρair)gH


View Answer (ρH – ρair)gH

The capacity of an accumulator is the maximum_________________?


aEnergy which it can store


bDischarge which it can deliver


cLiquid which it can store


dNone of these



In the Newton’s law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is ______________ the fluid viscosity?


aDirectly proportional to


bInversely proportional to


cInversely proportional to the square root of


dIndependent of



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