chemical engineering MCQs – Page 399

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 Review each marked answer and report any item that may be outdated or unclear.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
7961. The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about ____________ decibels?
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A. 60

B. 120

C. 105

D. 90
7962. Exposure to chemicals having carcinogenic properties cause ____________________?
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A. Asphyxiation (suffocation)

B. Asthma

C. Dermatitis (skin disorder)

D. Cancer
7963. The biological decomposition of organic substances in wastes controlled conditions is called_________________?
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A. Composting

B. Biological oxidation

C. None of these

D. Incineration

7964. Fluorosis (a bone disease) is caused by the presence of high concentration of ____________ in atmospheric air?
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A. Nitrogen dioxide

B. Hydrogen fluoride

C. Hydrogen sulphides

D. Hydrocarbons

7965. During sewage treatment, the sewage is subjected to ______________ treatment in Imhoff tank?
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A. Filtration

B. Digestion

C. Sedimentation

D. Both B. and C.
7966. A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called___________________?
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A. Cesspool

B. Septic tank

C. Skimming mill

D. Lagoon

7967. The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the __________________?
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A. Relative stability

B. Biological oxygen demand (BOD)

C. Bacterial stability factor

D. Oxygen ion concentration

7968. Presence of excess fluorine in water causes__________________?
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A. Respiratory disease

B. Dental cavity

C. Tooth decay

D. Fluorosis
7969. Which is the most efficient dust removal equipment for removal of submicronic dust particles from blast furnace gas ?
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A. Hydrocyclone

B. Packed scrubber

C. Gravity settling chamber

D. Electrostatic precipitator
7970. Claudes liquefaction process employs the cooling of gases by__________________?
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A. Expansion in an engine

B. Throttling

C. Following a constant pressure cycle

D. None of these

7971. Which of the following is the most major constituents of air pollutants ?
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A. Oxides of sulphur

B. Hydrogen sulphide

C. Oxides of nitrogen

D. Carbon monoxide

7972. TLV of lead for public sewer/waste water is about ______________ ppm?
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A. 150

B. 650

C. 1

D. 25

7973. The concentration of water vapour in troposphere, which depends upon the altitude & temperature, varies in the range of zero to ______________ percent?
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A. 4

B. 1

C. 12

D. 8

7974. Pick out the wrong statement?
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A. er water

B. Yellow phosphorous which is the most reactive allotropic form of phosphorous is transported

C. Nitrogen fixation means the process of bringing atmospheric nitrogen into combination i.e.

D. Urea is more hygroscopic than ammonium nitrate

E. OH)

F. o nitrogen compound form

7975. Death may occur, when SO2 concentration in atmospheric air exceeds ______________ ppm?
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A. 100

B. 20

C. 200

D. 400
7976. Presence of dissolved impurities of ______________ is responsible for the red brownish color of water?
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A. Arsenic

B. Iron & manganese

C. Carbonates

D. Bi-carbonates

7977. Which of the following dust collection equipments is the least efficient (for sub-micronic particles) ?
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A. Cyclone separator

B. Bag filter

C. Hollow wet scrubber

D. Dust catcher (gravity type)
7978. Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly _____________ substances?
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A. Radioactive

B. Inorganic

C. None of these

D. Organic

7979. Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by_________________?
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A. None of these

B. Discharging in the river stream

C. Quenching of hot coke

D. Filtration and recycling for cooling coke oven gas

7980. Carcinogenic air pollutants cause__________________?
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A. Asphyxiation (suffocation)

B. Bone decay

C. Anemia

D. Cancer