Chemical Engineering MCQs

Page No. 171

The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the_____________________?


aBarometric pressure


bSpeed of the impeller


cDiameter of the impeller


dBoth B. and C.


View Answer Barometric pressure

For flow through a venturi at a particular discharge, the correct relationships among velocities at point X, Y and Z would be __________________?


aV1 < V2 < V3


bV2 > V1 and V2 > V3


cV1 > V2 > V3


dNone of these


View Answer V2 > V1 and V2 > V3

A fluid (μ/ρ) = 0.01 cm2/sec is moving at critical flow condition (NRe = 2100) through a pipe of dia 3 cms. Velocity of flow is _______________ cm/sec?


a7


b700


c7000


d630


View Answer 7

Reciprocating pumps compared to centrifugal pumps__________________?


aDeliver liquid at uniform pressure


bCan handle slurries more efficiently


cAre not subject to air binding


dCan be operated with delivery valve closed



What is the value of co-efficient of discharge for square edged circular orifice (for β = 0.3 to 0.5) ?


a0.61 – 0.63


b0.5 – 0.75


c0.75 – 0.90


d0.35 – 0.55


View Answer 0.61 – 0.63

Bernoulli’s equation describes the _______________?


aMechanical energy balance in potential flow


bKinetic energy balance in laminar flow


cMechanical energy balance in turbulent flow


dMechanical energy balance in boundary layer



Major loss in sudden contraction in pipe flow is due to ________________?


aBoundary friction


bFlow contraction


cExpansion of flow after sudden contraction


dNone of these


View Answer Flow contraction

In case of laminar flow of fluid through a circular pipe, the__________________?


aShear stress over the cross-section is proportional to the distance from the surface of the pipe


bSurface of velocity distribution is a paraboloid of revolution, whose volume equals half the volume of circumscribing cylinder


cVelocity profile varies hyperbolically and the shear stress remains constant over the crosssection


dAverage flow occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius)



Baffles in mixing tanks are provided to__________________?


aReduce swirling and vortex formation


bIncrease the structural strength of the tank


cAid in rotational flow


dNone of these



Flow measurement in an open channel is done by a/an ________________?


aVenturimeter


bOrificemeter


cWeir


dRotameter


View Answer Weir

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