Jobs of an Environmental Engineering Interview Questions - Set 12 - ObjectiveBooks

Jobs of an Environmental Engineering Interview Questions - Set 12

Practice Test: Question Set - 12

1. Exposure to chemicals having carcinogenic properties cause
    (A) Dermatitis (skin disorder)
    (B) Cancer
    (C) Asphyxiation
    (D) Asthma

2. White smoke coming out of the chimney of a furnace indicates the use of
    (A) Low excess air
    (B) Very high excess air
    (C) Gaseous fuel in the furnace
    (D) Liquid fuel in the furnace

3. High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes
    (A) Cancer
    (B) Silicosis
    (C) Respiratory disease (e.g., asthma)
    (D) Reduced crop yield

4. Most efficient and suitable dust removal equipment for removal of fly-ash from flue gas in a thermal power plant is the
    (A) Gravity settling chamber
    (B) Cyclone separator
    (C) Electrostatic precipitator
    (D) Bag filter

5. A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the
    (A) Global warming
    (B) Green house
    (C) Atmospheric effect
    (D) Ionosphere

6. Pick out the wrong statement pertaining to 'green house' for the plants.
    (A) 'Green house' (made of glass) allows visible sunlight (i.e., short wavelength solar radiation like ultra-violet rays) to pass through the glass and heat up the soil thereby warming up plants inside it
    (B) The emitted longer wavelength radiation (e.g., infrared) is partly reflected and partly absorbed by the glass of the green house
    (C) 'Green house effect' in earth's atmosphere is due to increasing CO2 level in atmosphere, where CO2 acts like the glass of 'green house' thereby warming up the earth's surface
    (D) 'Green house' is colder than the outside atmosphere

7. The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.
    (A) Decreases
    (B) Increases
    (C) Remain constant
    (D) May increase or decrease; depends on the chemical characteristics of polluted water

8. In the context of the chemical process industries, the term BOD is normally associated with the
    (A) Characterization of solid wastes
    (B) Organic concentration in gaseous effluents
    (C) Characterization of liquid effluents
    (D) Characterization of boiler feed water

9. Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.
    (A) Turbidity
    (B) Color (Hazen)
    (C) Total solids
    (D) All (a), (b) & (c)

10. Iron & manganese present as pollutant in water cannot be removed by
    (A) Ion exchange process
    (B) Oxidation followed by settling & filtration
    (C) Lime soda process or manganese zeolite process
    (D) Chlorination

11. Which of the following is a green house gas other than CO2?
    (A) Methane
    (B) Nitrous oxide
    (C) Chlorofluoro carbons (CFC)
    (D) All (a), (b) and (c)

12. Which is the most practical and economical method for removal of suspended solid matter from polluted water?
    (A) Sedimentation
    (B) Skimming off
    (C) Chlorination
    (D) Biological oxidation

13. Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid flow control. It is caused due to
    (A) Reynold stresses
    (B) Shear forces
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

14. When the concentration of SO2 in air is greater than __________ ppm, it gives a pungent smell.
    (A) 0.01
    (B) 0.1
    (C) 1
    (D) 4

15. Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds __________ percent (by volume).
    (A) 1
    (B) 3
    (C) 7
    (D) 20

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