chemical engineering chemical environmental engineering chemical engineering MCQs – Page 10

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical environmental engineering chemical engineering Mcqs
181. Which of the following dust collection equipments is the least efficient (for sub-micronic particles) ?
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A. Dust catcher (gravity type)

B. Cyclone separator

C. Bag filter

D. Hollow wet scrubber

182. Permissible safe limit (TLV) of _____________ toxic gas is 100-1000 parts per million (ppm)?
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A. Moderately

B. Highly

C. Very extremely

D. Extremely

183. For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than ______________ ppm?
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A. 5

B. 1000

C. 10000

D. 500

184. 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.
185. Which of the following is a secondary air pollutant ?
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A. Dust particles

B. Nitrogen dioxide

C. Sulphur dioxide

D. Photochemical smog
186. In sewage treatment, the detention period allowed for oxidation ponds ranges from _____________ weeks?
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A. 1 to 2

B. 4 to 5

C. 15 to 20

D. 9 to 10

187. Workers working in _______________ industry are most prone to white lung cancer?
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A. Coal mining

B. Limestone mining

C. Textile

D. Asbestos

188. Ringelmann chart No. 2 corresponds to _______________ percent black smoke?
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A. 40

B. 10

C. 20

D. 80

189. Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10C, doubles the toxic effects of _____________ present in it?
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A. Coal ash

B. None of these

C. Ortho-xylene

D. Potassium cyanide
190. ______________ is the process of killing organism in water ?
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A. Sterilisation

B. Sedimentation

C. Disinfection

D. Coagulation

191. Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric airs water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes_________________?
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A. Respiratory trouble

B. Poor visibility due to sky darkening

C. Irritation in eyes

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

B. Chlorofluoro carbons (CFC)

C. Methane

D. All A., B. and C.
193. The amount of chemical coagulant added for treatment of polluted water ______________ with increase in temperature of the polluted water to be treated?
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A. May increase or decrease; depends on the chemical characteristics of polluted water

B. Remain constant

C. Decreases

D. Increases

194. The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is_________________?
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A. Cavitation

B. Pipe vibrations

C. Fluctuation in liquid flow

D. Boundary layer separation

195. Which of the following sources is responsible for maximum air pollution ?
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A. Photochemical oxidation of organic matter

B. Industrial chimney exhaust

C. Forest fire

D. Automobiles exhaust
196. Sulphur dioxide present in the industrial chimney exhaust gases causes____________________?
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A. Reduction in plants productivity owing to acid rain

B. All A., B. and C.

C. Respiratory & lung disease

D. Corrosion of building materials

197. Inhalation of silica dust by human being causes ___________________?
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A. Asphyxiation

B. Shortness of breath

C. Tuberculosis

D. Both B. & C.
198. Which of the following is an adsorbent used for the removal of SO2 from gas/air ?
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A. Active carbon

B. Limestone powder or alkalised alumina

C. Silica gel

D. Bog iron

199. Soluble silica present in boiler feed water can be removed by______________________?
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A. Filtration

B. Anion exchanger

C. Preheating it

D. Coagulation

200. TLV of ozone (O3) and phosgene (COCl2) in air is _______________ ppm?
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A. 25

B. 100

C. 1000

D. 0.1