Chemical Engineering MCQs

Page No. 248

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, the new discharge will be __________ litres/minute ?


a500


b200


c1000


d750


View Answer 500

Which of the following is most prone to pulsating discharge flow ?


aCentrifugal pump


bReciprocating pump


cGear pump


dAxial flow pump


View Answer Gear pump

I.D. of 1/4″ schedule 40 pipe is 0.364″. I.D. of a 1/2″ schedule 40 pipe would be ______________ inch?


a4.728


b0.5


c0.622


d0.474


View Answer 0.622

Slurries can be most conveniently pumped by a _______________ pump?


aScrew


bReciprocating


cGear


dCentrifugal


View Answer Centrifugal

Poise is converted into stoke by ___________________?


aMultiplying with density (gm/c.c)


bDividing by density (gm/c.c)


cMultiplying with specific gravity


dDividing by specific gravity



A tube is specified by its____________________?


aThickness only


bOuter diameter only


cThickness & outer diameter both


dInner diameter



In parallel pipe problems, the__________________?


aHead loss is the same through each pipe


bDischarge is the same through all the pipes


cTotal head loss is equal to the sum of the head losses through each pipe


dNone of these



In Newton’s law range, the drag co-efficient for the motion of spherical particle in a stationary fluid is___________________?


a0.44


b0.044


c4.4


d44


View Answer 0.44

For turbulent flow of Newtonian fluid in a circular cross-section pipe, the ratio of maximum to average fluid velocity is ________________?


a0.5


b1


c0.66


d< 0.5


View Answer 1

What is the shear rate at the pipe wall, in case of laminar flow of Newtonian fluids in a pipe of diameter ‘D’ & length ‘L’ incurring a pressure drop ‘Δp’ with average velocity ‘Vavg’ ?


aD Δp/8L


bD Δp/4L


c8 Vavg/D


d4 Vavg/D


View Answer 8 Vavg/D

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