chemical engineering MCQs – Page 401

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
8001. Maximum permissible residual chlorine in treated water should be ____________ mg/litre?
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A. 2 to 3

B. 5 to 10

C. 0.2 to 0.3

D. 0.001 to 0.01

8002. Ringelmann chart is used for the evaluation of _____________ pollution?
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A. Air

B. Radioactive

C. Noise

D. Water

8003. Shouting by a man at his full voice corresponds to a voice level of about _____________ decibels?
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A. 25

B. 80

C. 50

D. 120

8004. Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes_________________?
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A. All A., B. and C.

B. Nervous depression

C. Gastritis and diarrhea

D. Paralysis of muscles & loss of appetite

8005. Ozone is__________________?
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A. A primary pollutant

B. A secondary pollutant

C. Impervious to ultra-violet rays

D. Both B. and C.
8006. Exposure to chemicals having carcinogenic properties cause___________________?
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A. Asphyxiation

B. Dermatitis (skin disorder)

C. Cancer

D. Asthma

8007. Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause___________________?
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A. Explosion

B. Non biodegradable foam

C. Corrosion

D. Undesirable plant growth

8008. 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_________________?
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A. ACBB1A1A

B. ADBB1A1A

C. P1ACBP2P1

D. ACBDA
8009. Black smoke coming out of the chimney of a furnace is an indication of the use of ______________ in the furnace?
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A. Low amount of excess combustion air

B. Large quantity of excess combustion air

C. Hydrocarbon fuel

D. Pulverised coal as fuel

8010. ____________ is removed from water by lime-soda process?
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A. Permanent hardness

B. Foul smell and taste

C. Iron and manganese

D. Temporary hardness
8011. Troutons ratio of ______________ liquids is calculated using Kistyakowsky equation?
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A. Polar

B. Non-polar

C. Both A. & B

D. Neither A. nor B

8012. Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds ______________ percent (by volume)?
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A. 3

B. 1

C. 7

D. 20
8013. Pollution by particulate matter emission in the atmosphere does not take place during metal____________________?
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A. Polishing

B. Grinding

C. Machining

D. Cutting

8014. Which of the following is a green house gas other than CO2 ?
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A. All A., B. and C.

B. Chlorofluoro carbons (CFC)

C. Methane

D. Nitrous oxide

8015. Which of the following pollutants, if present in atmosphere is detectable by its odour ?
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A. SO2

B. CO

C. NO2

D. CO2

8016. Which of the following industries discharge mercury as a pollutant ?
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A. Chloro-alkali industry

B. Phosphoric acid plant

C. Beverage plant

D. Tanneries

8017. Brown spots in fabrics will be caused by washing with water containing large amount of___________________?
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A. Iodine

B. Bromine

C. Iron

D. Zinc

8018. Pick out the wrong statement pertaining to green house for the plants ?
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A. e ultra-violet rays) to pass through the glass and heat up the soil thereby warming up plants

B. the glass of the green house

C. Green house (made of glass) allows visible sunlight (i.e., short wavelength solar radiation

D. ide it

E. acts like the glass of green house thereby warming up the earths surface

F. Green house effect in earths atmosphere is due to increasing CO2 level in atmosphere, where

8019. Which of the following is not a secondary air pollutant ?
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A. Sulphur dioxide

B. Photochemical smog

C. All A., B. & C.

D. Ozone

8020. Which is an example of closed system ?
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A. Air compressor

B. Liquid cooling system of an automobile

C. Boiler

D. None of these