Chemical Engineering MCQs

Page No. 65

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


a25

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b50

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c80

✓


d120

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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

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b3

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c7

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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

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bShear forces

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cBoth A. & B.

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dNeither A. nor B.

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View Answer Both A. & B.

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


aMethane

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bNitrous oxide

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cChlorofluoro carbons (CFC)

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d All A., B. and C.

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View Answer All A., B. and C.

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


aTurbidity

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bColor (Hazen)

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cTotal solids

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dAll A., B. & C.

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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

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b Increases

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cRemain constant

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

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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

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bGreen house

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cAtmospheric effect

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dIonosphere

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View Answer Green house

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


aReduction in working efficiency of manpower

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bFatigue

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cHigh breathing rate

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d All A., B. & C.

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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

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cPetroleum refinery

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dIron & steel plant

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View Answer Food industry

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


aBlood poisoning

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bAnaemia

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cNervous system disorder

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dAll A., B. and C.

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View Answer All A., B. and C.

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