Chemical Environmental Engineering MCQs

141 MCQs  — Chemical Engineering MCQs  (Page 9 of 15)

Attempt Chemical Environmental Engineering Quiz
Removal of ______________ is accomplished by aeration of water?
A. Dissolved gases
B. Suspended solids
C. Dissolved solids
D. None of these
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Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ?
A. By chemical coagulation
B. In sedimentation tanks equipped with mechanical scrapper
C. In vacuum filter
D. In clarifiers
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Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called__________________?
A. Grit
B. Dust
C. Powder
D. Smoke
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Inhalation of silica dust causes a disease called__________________?
A. Bronchitis
B. Silicosis
C. Pneumoconiosis
D. None of these
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Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by__________________?
A. Biological oxygen pond
B. Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)
C. Lagoons
D. Filtration
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A shallow pond in which the sewage is retained and biologically treated is called__________________?
A. Oxidation
B. Imhoff tank
C. Lagoon
D. Skimming tank
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Main pollutants released from iron & steel industry is__________________?
A. Co, co2 & so2
B. H2s, no & so3
C. Co2, h2s & no2
D. So3, no2 & co2
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Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan_________________?
A. With greater number of blades
B. Of increased diameter
C. Both a. & b.
D. Neither a. nor b.
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The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is_________________?
A. Pipe vibrations
B. Cavitation
C. Boundary layer separation
D. Fluctuation in liquid flow
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Dust collection efficiency of a cyclone separator depends upon its______________?
A. Diameter
B. Inlet gas velocity
C. Overall height
D. All a., b. & c.
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Word of the Day
23 Jul
Aisle
a passage between rows of seats in a building such as a church or theatre, an aircraft, or train.
طویل تنگ راستہ، نشتوں کے درمیان راستہ

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