Chemical Engineering MCQs

Page No. 245

A pump operating under specific conditions delivers insufficient quantity of liquid. This may be set right by________________?


aDecreasing the size of the inlet pipe


bIncreasing the size of the inlet pipe


cLowering the pump position


dBoth B. and C.


View Answer Both B. and C.

The ratio of pressure forces to inertial forces is called the _______________ number?


aFroude


bEuler


cReynold


dMach


View Answer Euler

In case of turbulent flow of fluid through a circular pipe, the __________________?


aMean flow velocity is about 0.5 times the maximum velocity


bVelocity profile becomes flatter and flatter with increasing Reynolds number


cPoint of maximum instability exists at a distance of 2r/3 from the pipe wall (r = pipe radius)


dSkin friction drag, shear stresses, random orientation of fluid particles and slope of velocity profile at the wall are more



The ratio of the depth of flow to the diameter of the channel for maximum discharge in a circular channel in open channel flow is________________?


a0.1


b0.55


c0.95


d1.85


View Answer 0.95

Forces acting on a particle settling in fluid are _____________ forces?


aGravitational & buoyant


bCentrifugal & drag


cGravitational or centrifugal buoyant drag


dExternal, drag & viscous



Fluid resistance to shear depends upon its_______________?


aRate of transfer of molecular momentum


bCohesion


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

Which of the following relationship is valid for the equilibrium position of the float in a Rotameter? (Where, Df= Drag force on the float Bf = Buoyant force on the float Wf = Weight of the float)?


aDf + Bf = Wf


bDf = Bf + Wf


cDf + Bf + Wf =0


dNone of these


View Answer Df + Bf = Wf

The equation relating friction factor to Reynold number, f-0.5 = 4 loge (NRe/√f)-0.4, is called the _____________ equation?


aNikuradse


bVon-Karman


cBlasius


dColebrook


View Answer Nikuradse

Applicability of Bernoulli’s equation is limited to a/an _____________ fluid, that does not exchange shaft work with the surroundings?


aIncompressible


bNon-viscous


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

Potential flow is characterised by the___________________?


aIrrotational and frictionless flow


bIrrotational and frictional flow


cOne in which dissipation of mechanical energy into heat occurs


dFormation of eddies within the stream



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