Chemical Engineering MCQs

Page No. 235

Boundary layer thickness in laminar flow over a flat plate increases as(where, d = distance from the leading edge.) ?


a√d


bd1/3


cd2


dd2/3


View Answer √d

____________ flow means the flow of incompressible fluid with no shear ?


aPotential


bStreamline


cCreep


dBoundary layer


View Answer Potential

Centrifugal pump can’t be used to pump _____________________?


aMolten sodium (used as a coolant in Fast Breeder Reactor)


bModerately viscous vegetable oil used in soap industry


cThick molten soap at 80°C


dNone of the above



A weir is used to measure the large water discharge rate from a river or from an open channel. A weir is not of _______________ shape?


aCircular


bRectangular


cTriangular


dTrapezoidal


View Answer Circular

An ideal fluid is___________________?


aFrictionless & incompressible


bOne, which obeys Newton’s law of viscosity


cHighly viscous


dNone of these



______________ is an example of axial flow impeller?


aPaddle


bTurbine


cPropeller


dAll A., B. and C.


View Answer Propeller

The distance between metacentre and ______________ is called metacentric height?


aWater surface


bCentre of gravity


cCentre of buoyancy


dNone of these


View Answer Centre of gravity

Enamels and paints are generally _______________ fluid?


aRheopectic


bPseudo-plastic


cThixotropic


dDilatant


View Answer Pseudo-plastic

A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, then the new head will be ______________ metres?


a2


b4


c8


d5.5


View Answer 2

The Reynolds number for an ideal fluid flow is _________________?


a4


b2100-40004000


c4000


d


View Answer

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