Chemical Engineering MCQs

Page No. 69

____________ substances present in sewage are removed in grit chamber during sewage treatment?


aOrganic


bFatty


cInorganic


dDissolved


View Answer Inorganic

Industrial workers working in leather tanning & manufacturing units are prone to suffer from ___________________?


aRespiratory ailments (e.g. bronchitis)


bSkin diseases (e.g. dermatitis)


cSilicosis


d Blurred vision



Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by_______________?


aChlorination


bTreating in biological oxygen pond


cChemical coagulation


dNone of these



Ionisation potential employed in the industrial electrostatic precipitator is of the order of_______________?


a30 to 70 kV DC


b30 to 70 kV AC


c 230 V AC


d230 V DC


View Answer 30 to 70 kV DC

Noise level during normal conversation among men is about ______________ decibels?


a10


b45


c90


d 115


View Answer 45

Exposure to small amount of ______________ results in high blood pressure & heart disease in human beings?


aHydrogen sulphide


bMercury


cCadmium


dAsbestos


View Answer Cadmium

Which of the following acts as a natural source of air pollution ?


a. Forest fire


bDeforestation


cVolcanic eruption


d None of these


View Answer Volcanic eruption

A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as shown below in the P-V diagram. The net work done during the complete cycle is given by the area covered by_________________?


a P1ACBP2P1


bACBB1A1A


cACBDA


dADBB1A1A


View Answer ACBDA

The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by_________________?


aBiological oxygen pond


bAerated lagoons


cTrickling filters


dGravity separator having oil skimming devices



Noise emitted by a ventilation fan at a distance of 3 metres is about _____________ decibels?


a85


b105


c 125


d145


View Answer 105

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