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.Management Sciences
Category: Chemical Environmental Engineering
Foaming and priming in boiler operation can be reduced by reduction in ______________ in feed water?
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A. Turbidity
B. Color (Hazen)
C. Total solids
D. All A., B. & C.
Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called_________________?
A. Fumes
B. Mists
C. Smoke
D. Aerosols
Peroxyacetyl nitrate (PAN), a pollutant is found in the_________________?
A. Automobile exhaust
B. Flue gas of coal based power plant
C. Exhaust of nitric acid plant
D. Exhaust of sulphuric acid plant
Which of the following fine dust removal equipments is the most efficient ?
A. Bag filter
B. Scrubber
C. Electrostatic precipitator
D. Cyclone separator
The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ?
A. Chlorine
B. Alkalis
C. Benzene hexachloride
D. Alkyl benzene sulphonate (ABS)
Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur ?
A. Thermosphere
B. Troposphere
C. Stratosphere
D. None of these
During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum ?
A. Idle running
B. Acceleration
C. Cruising
D. Deceleration
In sewage treatment, the detention period allowed for oxidation ponds ranges from _____________ weeks?
A. 1 to 2
B. 4 to 5
C. 9 to 10
D. 15 to 20
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