Chemical Engineering MCQs

Page No. 167

A bed consists of particles of density 2000 kg/m3. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is_________________?


a25.61 kPa


b11.77 kPa


c14.86 kPa


d21.13 kPa


View Answer 11.77 kPa

The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is_________________?


aQ∝N : H∝N2 : P∝N3


bQ∝N2 : H∝N3 : P∝N


cQ∝N : H∝N3 : P∝N2


dQ∝N3 : H∝N : P∝N2



In Newton’s law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the ______________ of its diameter?


aInverse


bSquare root


cSecond power


dFirst power


View Answer Square root

Which of the following is an undesirable property of a manometric liquid ?


aNon-sticky & non-corrosive nature


bHigh vapour pressure


cLow viscosity & surface tension


dLow co-efficient of thermal expansion


View Answer High vapour pressure

With a constant diameter impeller of a centrifugal pump _____________________?


aIts capacity varies directly as the square of speed


bHead varies as the square of speed


cHorsepower input varies as the square of speed


dHead varies as the speed



Maintenance cost of a ______________ pump for a particular duty is the least?


aCentrifugal


bReciprocating


cVolute


dGear


View Answer Centrifugal

Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an ________________?


aPitot tube


bVenturimeter


cOrificemeter


dRotameter


View Answer Pitot tube

N. second/m2 is___________________?


aThe S.I. unit of dynamic viscosity


bThe S.I. unit of kinematic viscosity


cEquivalent to one poise


dEquivalent to one stoke



The dimension of surface tension is________________?


aML-2


bMT-2


cMLT-2


dML-2T


View Answer MT-2

Friction factor for a hydraulically smooth pipe at NRe = 2100 is f1. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will_______________?


aIncrease


bDecrease


cRemain unchanged


dIncrease or decrease depending on the pipe material


View Answer Increase

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