Chemical Engineering MCQs

Page No. 52

Dust collection efficiency of a cyclone separator depends upon its______________?


aDiameter

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b Inlet gas velocity

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cOverall height

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dAll A., B. & C.

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View Answer All A., B. & C.

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


aPipe vibrations

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bCavitation

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cBoundary layer separation

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dFluctuation in liquid flow

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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

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bOf increased diameter

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c Both A. & B.

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dNeither A. nor B.

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View Answer Both A. & B.

Main pollutants released from iron & steel industry is__________________?


a CO, CO2 & SO2

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bH2S, NO & SO3

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cCO2, H2S & NO2

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dSO3, NO2 & CO2

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View Answer CO, CO2 & SO2

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


a Oxidation

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b Imhoff tank

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c Lagoon

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dSkimming tank

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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

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

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cLagoons

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dFiltration

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Inhalation of silica dust causes a disease called__________________?


aBronchitis

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bSilicosis

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cPneumoconiosis

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dNone of these

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View Answer Silicosis

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


a Grit

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b Dust

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cPowder

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dSmoke

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View Answer Grit

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


aJune

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b December

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cJuly

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dSeptember

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View Answer June

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


aAlum

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bBleaching powder

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cActivated carbon

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dCopper sulphate

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View Answer Activated carbon

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