chemical engineering MCQs – Page 396

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 Review each marked answer and report any item that may be outdated or unclear.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
7901. Ethanolamine is an absorbent used for the removal of _____________ from air/gas?
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A. HF

B. SO2

C. H2S

D. Both B. & C.
7902. Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gasair mixture), rendering it the property of the most explosive gas ?
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A. Ammonia

B. Hydrogen

C. Acetylene

D. Carbon monoxide

7903. _____________ plant emits large amount of SO2 as an air pollutant?
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A. Iron & steel

B. Nitric acid

C. Chlor alkali

D. Sulphuric acid
7904. Fine grit present in sewage is removed in the _____________ during sewage treatment?
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A. Trickling filter

B. Grit chamber

C. Skimming tank

D. Detritus tank
7905. Which is the most practical and economical method for removal of suspended solid matter from polluted water ?
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A. Sedimentation

B. Biological oxidation

C. Chlorination

D. Skimming off

7906. Foul odour and bad taste of water is removed by treating with__________________?
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A. Activated carbon

B. Bleaching powder

C. Alum

D. Copper sulphate

7907. ______________ cannot control the noise pollution ?
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A. Use of silencers

B. Vibration damping

C. Green house gases

D. Tree plantation

7908. Pick out the wrong statement. A. Caustic embrittlement of boilers metallic parts is caused by high concentration of caustic soda in boiler feed water___________________?
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A. Cooling and freezing of water kills the bacteria present in it

B. Dissolved oxygen content in high pressure boiler feed water should be nil

C. ica in feed water goes on decreasing

D. With increasing boiler operating pressure of steam, the maximum allowable concentration of

7909. Inhalation of silica dust causes a disease called__________________?
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A. Silicosis

B. None of these

C. Bronchitis

D. Pneumoconiosis

7910. A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of _____________ high above earths atmosphere, which absorbs it?
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A. Carbon dioxide

B. Hydrogen

C. Ozone

D. None of these

7911. Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ?
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A. By chemical coagulation

B. In sedimentation tanks equipped with mechanical scrapper

C. In clarifiers

D. In vacuum filter

7912. Dissolved oxygen content in river water is around _____________ ppm?
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A. 5

B. 100

C. 500

D. 250

7913. Presence of ____________ in water stream are deleterious to aquatic life?
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A. Heavy metals and cyanides

B. Soluble and toxic organics

C. Suspended solids

D. All A., B. & C.
7914. Inorganic impurities causing water pollution is ____________________?
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A. Protein

B. Fats

C. Salts of metals

D. Carbohydrates

7915. Most efficient and suitable dust removal equipment for removal of fly-ash from flue gas in a thermal power plant is the__________________?
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A. Cyclone separator

B. Gravity settling chamber

C. Bag filter

D. Electrostatic precipitator
7916. Removal of ______________ is accomplished by aeration of water?
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A. Dissolved solids

B. Suspended solids

C. None of these

D. Dissolved gases
7917. Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is__________________?
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A. Inversely proportional to viscosity of gas

B. Proportional to the viscosity & density of the gas

C. Proportional to the pressure of the gas

D. Both B. and C.
7918. The main industrial source of emission of hydrogen sulphide air pollutant is________________?
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A. Petroleum refineries

B. Metallurgical roasting & smelting plant

C. Coal based thermal power plants

D. Pulp and paper plant

7919. Turbidity of water is an indication of the presence of__________________?
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A. Suspended inorganic matter

B. Dissolved gases

C. Floating solids

D. Dissolved solids

7920. TLV of ozone (O3) and phosgene (COCl2) in air is _______________ ppm?
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A. 0.1

B. 25

C. 1000

D. 100