chemical engineering MCQs – Page 392

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 Review each marked answer and report any item that may be outdated or unclear.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
7821. In sewage treatment, its sedimentation is speeded up by commonly adding__________________?
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A. Sodium sulphate

B. Lime

C. Hydrochloric acid

D. Copper sulphate

7822. The Killer gas which caused Bhopal gas tragedy in 1984 was________________?
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A. Sulphur dioxide

B. Methyl isocyanate (MIC)

C. Phosgene

D. Carbon monoxide

7823. Most of the atmospheric air pollutants are present in large quantity in__________________?
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A. Stratosphere

B. Mesosphere

C. Troposphere

D. Thermosphere

7824. Arsenic pollutant is not generated in _______________ industries?
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A. Tanneries

B. Any of these

C. Glass & ceramic

D. Beverages
7825. Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes_______________?
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A. Foaming

B. Odour nuisances

C. Undesirable plant growth

D. Turbidity

7826. The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is_________________?
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A. Pipe vibrations

B. Boundary layer separation

C. Cavitation

D. Fluctuation in liquid flow

7827. A man exposed to excessive noise level in the working environment may suffer from____________________?
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A. Rupture of ear drum

B. Hearing loss

C. All A., B. & C.

D. Nervousness & fatigue

7828. The common pollutant generated in chlor-alkali industry and battery manufacture is ___________________?
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A. Mercury

B. None of these

C. Phosphate

D. Brine

7829. The maximum CO2 is emitted into the atmosphere by_________________?
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A. Biomass burning

B. Trees

C. Combustion

D. Urea

7830. Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about ____________ decibels?
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A. 7

B. 30

C. 3

D. 70

7831. Soluble silica present in boiler feed water can be removed by______________________?
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A. Preheating it

B. Filtration

C. Coagulation

D. Anion exchanger
7832. TLV of NO2 & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO2 causes_________________?
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A. Bone disease

B. Skin disorder

C. Bronchitis

D. Cancer

7833. Corrosion in boilers can be prevented by _________________?
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A. prevents corrosion

B. Enhancing pH of feed water by adding alkali

C. All A., B. and C.

D. Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen

E. Deaeration of feed water

7834. Smoke is produced due to__________________?
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A. Poor quality of fuel and improper mixing of fuel & combustion air

B. All A., B. and C.

C. Poor design & overloading of furnace

D. Insufficient supply of combustion air and insufficient time for combustion

7835. Methyl isocyanate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of ______________ toxic gas?
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A. Highly

B. Extremely

C. Moderately

D. Very extremely
7836. Lagooning process is mainly a means of the__________________?
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A. None of these

B. Biological treatment of wastes

C. Sludge disposal

D. Reduction of excessive flow in sewers

7837. Safe limit called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the____________________?
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A. Burning of domestic fuel

B. Industrial chimney exhaust

C. Automobiles exhaust

D. Photochemical reaction in polluted atmosphere

7838. Water filtration rate in a slow sand filter ranges from ____________ litres/m2/hr?
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A. 100 to 200

B. 4000 to 5000

C. 10 to 20

D. 1500 to 2500

7839. The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of _____________ of water?
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A. Dissolved oxygen content

B. All A., B. and C.

C. Biological oxygen demand

D. Vapor pressure

7840. Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxiate is ? _____________ percent?
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A. 80

B. 92

C. 88

D. 84