Chemical Engineering MCQs

Page No. 251

In a free vortex, the_____________________?


aVelocity changes linearly with radial distance


bFlow is necessarily rotational


cRadial component of velocity is same everywhere


dStream lines are not circular



In continuous fluidisation_________________?


aSolids are completely entrained


bThe pressure drop is less than that for batch fluidisation


cThere is no entrainment of solids


dVelocity of the fluid is very small



Drag co-efficient for flow past immersed body is the ratio of _____________ to the product of velocity head and density?


aShear stress


bShear force


cAverage drag per unit projected area


dNone of these



The boundary layer thickness at a given section along a flat plate _____________ with increasing Reynold’s number?


aIncreases


bDecreases


cRemain same


dMay increase or decrease


View Answer Decreases

Transition length for a turbulent fluid entering into a pipe is around _____________ times the pipe diameter?


a5


b50


c500


d5000


View Answer 50

Centrifugal pumps as compared to reciprocating pumps__________________?


aRun at a lower speed for the same discharge


bDo not need priming


cDeliver fluid with pulsating/fluctuating discharge


dCan be run with discharge line valve closed for a short interval



Pressure drop (Δp) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as___________________?


aV1.8


bV-0.2


cV2.7


dV2


View Answer V2

Lower BWG means _____________ of the tube?


aLower thickness


bLower cross-section


cOuter diameter


dInner diameter


View Answer Lower cross-section

Which of the following facilitates close control of flow of fluids ?


aGate valve


bGlobe valve


cButterfly valve


dCheck valve


View Answer Globe valve

What is the maximum theoretical suction lift (metres) of a reciprocating pump ?


a5


b10


c50


d100


View Answer 10

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