chemical engineering Mcqs
7952. For an isothermal process, the internal energy of a gas____________________?
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A. Increases

B. Data insufficient, cant be predicted

C. Decreases

D. Remains unchanged
7958. Green house effect is accentuated by________________?
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A. Deforestation

B. Increased transportation activity

C. Rapid industrialisation

D. All A., B. and C.
7962. Exposure to chemicals having carcinogenic properties cause ____________________?
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A. Asphyxiation (suffocation)

B. Asthma

C. Dermatitis (skin disorder)

D. Cancer
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

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

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)
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
7981. Nitrogen oxides (NOx) is not produced in the ______________ industry?
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A. Nitrogenous fertiliser

B. Detergent

C. Any of these

D. Nitric acid making

7983. Dust collection efficiency of a cyclone separator depends upon its______________?
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A. Overall height

B. Diameter

C. Inlet gas velocity

D. All A., B. & C.
7990. Industrial workers working in leather tanning & manufacturing units are prone to suffer from ___________________?
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A. Silicosis

B. Skin diseases (e.g. dermatitis)

C. Blurred vision

D. Respiratory ailments (e.g. bronchitis)

7993. Aerobic biological oxidation ponds used for the purification of polluted water__________________?
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A. Destroys/removes pathogen from the sewage

B. Is not very effective for non-biodegradable substances (e.g. ABS) containing effluents

C. Destroys/removes pathogen much more effectively if the sewage is chlorinated

D. All A., B. & C.
7998. High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes____________________?
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A. Reduced crop yield

B. Respiratory disease (e.g., asthma)

C. Silicosis

D. Cancer