chemical engineering chemical environmental engineering chemical engineering MCQs – Page 8

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 Review each marked answer and report any item that may be outdated or unclear.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
141. The pH value of oxidised sewage is about_____________________?
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A. 7.3

B. 1.8

C. 13.4

D. 6.2

142. Green house gases blanket/block the infrared radiation from earths surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect ?
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A. SO3

B. N2

C. H2

D. CO2

143. Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid flow control. It is caused due to_________________?
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A. Reynold stresses

B. Shear forces

C. Both A. & B.

D. Neither A. nor B.

144. Higher concentration of nitrogen dioxide in atmospheric air causes___________________?
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A. Cancer

B. Bronchitis

C. Corrosion

D. Asphyxiation

145. Presence of bacteria in potable (drinking) water causes_________________?
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A. Disease

B. Bad odour

C. Turbidity

D. Bad taste & colour

146. Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur ?
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A. None of these

B. Thermosphere

C. Troposphere

D. Stratosphere

147. 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. 70

B. 7

C. 30

D. 3
148. The average thickness of ozone layer in stratosphere is about _______________ dobson unit (DU)?
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A. 230

B. 20

C. 1500

D. 750

149. A standard test for determination of hardness in water is termed as ______________ test?
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A. Total count

B. Presumptive

C. Electometric

D. EDTA
150. Presence of soluble organics in polluted water causes_________________?
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A. Explosion hazards

B. Undesirable plants growth

C. Depletion of oxygen

D. Fire hazards

151. Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of_________________?
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A. Ultraviolet light for irradiation of water

B. Ozone and iodine

C. Chlorine or its compounds

D. All A., B. & C.
152. Disinfection of water is done to remove ______________________?
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A. Foul odour

B. Color

C. Bacteria

D. Bad taste

153. In sewage treatment, its sedimentation is speeded up by commonly adding__________________?
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A. Hydrochloric acid

B. Lime

C. Copper sulphate

D. Sodium sulphate

154. The most commonly used chemical coagulant in water treatment is________________?
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A. Lime

B. Ferrous sulphate

C. Hydrazine

D. Alum
155. In water treatment, alum [Al2(SO4)3] is used for the process of __________________?
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A. Sedimentation

B. Coagulation

C. Filtration

D. Disinfection

156. H2S present in gaseous stream can be removed by adsorption on _____________________?
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A. Silica gel

B. Active carbon

C. Limestone powder

D. Bog iron
157. Inhalation of silica dust causes a disease called__________________?
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A. None of these

B. Bronchitis

C. Pneumoconiosis

D. Silicosis
158. 80% less than 200 mesh size particles are called____________________?
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A. Grit

B. Powder

C. Aggregates

D. Smoke

159. Growth of ______________ is promoted by the presence of manganese in water?
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A. Algae

B. Files

C. Micro-organisms

D. Mosquitoes

160. Pneumoconiosis is a disease caused by the inhalation of ______________ dust?
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A. Coal

B. Iron ore

C. Uranium ore

D. Lime