Chemical Engineering MCQs

Page No. 44

Fresh sewage is ______________ in nature?


a Acidic

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bNeutral

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cAlkaline

✓


dHighly acidic

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View Answer Alkaline

From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about ________________ ppm?


a 5

✓


b50

✖


c 500

✖


d5000

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View Answer 5

Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is _______________ micro gram (μ g)/litre?


a22

✖


b42

✓


c 332

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d1050

✖


View Answer 42

Which of the following fine dust removal equipments is the most efficient ?


aBag filter

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bScrubber

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cElectrostatic precipitator

✓


dCyclone separator

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Noise level in a quiet private business office is about _____________ decibels?


a25

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b50

✓


c70

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d 85

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View Answer 50

Which of the following is not a weightless pollutant ?


a SPM

✓


bThermal pollution

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cRadioactive rays

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dNoise pollution

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View Answer SPM

Noise pollution level in a chemical plant is expressed in __________________?


aRoentgen

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bDecibel

✓


c Hertz

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d None of these

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View Answer Decibel

Smog is ______________________?


aNothing but black smoke

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bA combination of smoke and fog

✓


cA liquid particle resulting from vapor condensation

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dA solid particle e.g. fly-ash

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Pick out the wrong statement ?


aAddition of methane to the furnace atmosphere reduces decarburising by hydrogen

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b Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon gasescarburise the surface of steel at annealing temperatures

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cActive nitrogen (formed by cracking ammonia at the metal surface) cause nitride formationwith increase in surface hardness

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dNone of these

✓


View Answer None of these

Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________?


aChemical coagulation

✓


bFloatation & skimming

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cCentrifugation

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dUltra filtration

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View Answer Chemical coagulation

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