Chemical Engineering MCQs

Page No. 247

In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow ?


aDischarge of water by a centrifugal pump being run at a constant rpm


bWater flow in the suction and discharge pipe of a reciprocating pump


cWater discharge from a vertical vessel in which constant level is maintained


dLow velocity flow of a highly viscous liquid through a hydraulically smooth pipe



The boundary layer is that part of a moving fluid, in which the fluid velocity is_________________?


aAffected by the fluid flow pressure


bConstant


cAffected by the presence of a solid boundary


dAll A., B. and C.



For turbulent flow of an incompressible fluid through a pipe, the flow rate „Q‟ is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent ‘n’ is_________________?


a1


b0


c< 1


d> 1


View Answer < 1

What is the value of Fanning friction factor f ‘ for smooth pipe at NRe = 106 approximately ?


a0.003


b0.01


c0.1


d0.3


View Answer 0.003

In the complete turbulence zone (in rough pipes), the____________________?


aRough and smooth pipes have the same friction factor


bLaminar film covers the roughness projections


cFriction factor depends upon NRe only


dFriction factor is independent of the relative roughness



Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around________________?


a2000


b10


c100


d1000


View Answer 1000

Equivalent length of a pipe fitting is____________________?


aDependent on Reynolds number


bIndependent of Reynolds number


cDependent on the length of the pipe


dNone of these



In deriving Bernoulli’s equation, fluid is assumed to be________________?


aIncompressible, frictionless, steady, along a streamline


bUniform, steady, incompressible, along a streamline


cSteady, density being pressure dependent, frictionless


dNone of these



Self-priming centrifugal pump can be used for________________?


aBooster service


bPumping liquid fertilisers (e.g. liquid NH3)


cPumping industrial wastes


dAll A., B. and C.


View Answer All A., B. and C.

Discharge in laminar flow through a pipe varies________________?


aAs the square of the radius


bInversely as the pressure drop


cInversely as the viscosity


dAs the square of the diameter



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