Chemical Engineering MCQs

Page No. 65

Shouting by a man at his full voice corresponds to a voice level of about _____________ decibels?


a25


b50


c80


d120


View Answer 80

Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds ______________ percent (by volume)?


a 1


b3


c7


d20


View Answer 20

Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid flow control. It is caused due to_________________?


aReynold stresses


bShear forces


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

Which of the following is a green house gas other than CO2 ?


aMethane


bNitrous oxide


cChlorofluoro carbons (CFC)


d All A., B. and C.


View Answer All A., B. and C.

Foaming and priming in boiler operation can be reduced by reduction in ______________ in feed water?


aTurbidity


bColor (Hazen)


cTotal solids


dAll A., B. & C.


View Answer All A., B. & C.

The amount of chemical coagulant added for treatment of polluted water ______________ with increase in temperature of the polluted water to be treated?


aDecreases


b Increases


cRemain constant


d May increase or decrease; depends on the chemical characteristics of polluted water


View Answer Decreases

A ‘body’ which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the________________?


aGlobal warming


bGreen house


cAtmospheric effect


dIonosphere


View Answer Green house

Thermal pollution due to excessive heat & temperature in the working place causes__________________?


aReduction in working efficiency of manpower


bFatigue


cHigh breathing rate


d All A., B. & C.


View Answer All A., B. & C.

Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in___________________?


aFood industry


bMunicipal sewage treatment


cPetroleum refinery


dIron & steel plant


View Answer Food industry

Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes________________?


aBlood poisoning


bAnaemia


cNervous system disorder


dAll A., B. and C.


View Answer All A., B. and C.

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