Chemical Engineering MCQs

Page No. 220

The hydrodynamic and thermal boundary layers will merge, when ____________________?


aPrandtl number is one


bSchmidt number tends to infinity


cNusselt number tends to infinity


dArchimedes number is greater than 10000


View Answer Prandtl number is one

The velocity profile exhibited by laminar flow of Newtonian fluids is such that the velocity distribution w.r.t. radius of the circular pipe is a/an ______________ with the apex at the centre line of the pipe?


aHyperbola


bParabola


cSemi-circle


dSemi-ellipse


View Answer Parabola

A centrifugal pump is called a turbine pump, if it is having a_________________?


aTurbine type impeller


bVaned diffusion casing


cRotating vaned volute


dNone of these



In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure ______________ the vapor pressure of the liquid at the suction temperature?


aLower than


bHigher than


cEqual to


dNone of these


View Answer Equal to

A mercury (specific gravity = 13.6) manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 1.6), then for the same flow rate of water the new manometer reading will be _______________ cms?


a17


b42


c84


d1.8


View Answer 17

Power required for mixing Newtonian fluids is a function of the _________________?


aSpeed of impeller, diameter of impeller & viscosity


bDensity & viscosity of fluid only


cDensity of fluid, viscosity of fluid & impeller dia only


dNone of these


View Answer None of these

Which of the following properties of a fluid is responsible for offering resistance to shear ?


aSurface tension


bViscosity


cSpecific gravity


dAll A., B., and C.


View Answer Viscosity

Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of ______________ flow type?


aAxial


bRadial


cMixed


dNone of these


View Answer Axial

The Mach number for hypersonic flow of compressible fluid is____________________?


a1


b> 1


c> 4


d< 2


View Answer > 4

Priming is needed in a ______________ pump?


aReciprocating


bGear


cCentrifugal


dDiaphragm


View Answer Centrifugal

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