Chemical Engineering MCQs

Page No. 52

Dust collection efficiency of a cyclone separator depends upon its______________?


aDiameter


b Inlet gas velocity


cOverall height


dAll A., B. & C.


View Answer All A., B. & C.

The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is_________________?


aPipe vibrations


bCavitation


cBoundary layer separation


dFluctuation in liquid flow


View Answer Cavitation

Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan_________________?


aWith greater number of blades


bOf increased diameter


c Both A. & B.


dNeither A. nor B.


View Answer Both A. & B.

Main pollutants released from iron & steel industry is__________________?


a CO, CO2 & SO2


bH2S, NO & SO3


cCO2, H2S & NO2


dSO3, NO2 & CO2


View Answer CO, CO2 & SO2

A shallow pond in which the sewage is retained and biologically treated is called__________________?


a Oxidation


b Imhoff tank


c Lagoon


dSkimming tank


View Answer Oxidation

Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by__________________?


a Biological oxygen pond


bRadial settling tank (thickener) using coagulant (lime & ferrous sulphate)


cLagoons


dFiltration



Inhalation of silica dust causes a disease called__________________?


aBronchitis


bSilicosis


cPneumoconiosis


dNone of these


View Answer Silicosis

Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called__________________?


a Grit


b Dust


cPowder


dSmoke


View Answer Grit

World environment day is observed every year on the 5th of___________________?


aJune


b December


cJuly


dSeptember


View Answer June

Foul odour and bad taste of water is removed by treating with__________________?


aAlum


bBleaching powder


cActivated carbon


dCopper sulphate


View Answer Activated carbon

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