Environmental Engineering and Safety Computer Online Test - Set 08 - ObjectiveBooks

Environmental Engineering and Safety Computer Online Test - Set 08

Practice Test: Question Set - 08

1. 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.
    (A) 3
    (B) 30
    (C) 7
    (D) 70

2. Ethanolamine is an absorbent used for the removal of __________ from air/gas.
    (A) HF
    (B) SO2
    (C) H2S
    (D) Both (b) & (c)

3. Lagoons used for purification of polluted water
    (A) Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds
    (B) Use micro-organisms/bacteria in presence of dissolved oxygen
    (C) Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/liter and BOD = 3.8 mg/liter
    (D) All (a), (b) & (c)

4. Which is the most efficient dust removal equipment for removal of submicronic dust particles from blast furnace gas?
    (A) Packed scrubber
    (B) Gravity settling chamber
    (C) Electrostatic precipitator
    (D) Hydrocyclone

5. 5-200 μm size particles are called
    (A) Colloids or aerosols
    (B) Powder
    (C) Dust
    (D) Smoke

6. Pick out the wrong statement.
    (A) Biological oxygen demand (BOD) is a characteristic and not a constituent of water
    (B) BOD is a measure of the amount of oxygen which will be demanded & used in 5 days by the biological decomposition of the organic matter present in water stream present as food for the living organism
    (C) BOD is expressed in mg/liter (typically, BOD=2.5 mg/liter for potable water)
    (D) None of these

7. A man exposed to excessive noise level in the working environment may suffer from
    (A) Hearing loss
    (B) Rupture of ear drum
    (C) Nervousness & fatigue
    (D) All (a), (b) & (c)

8. Presence of nitrates in water in excess of 50 ppm causes
    (A) Methemoglobinemia
    (B) Gastroenteritis
    (C) Asphyxiation
    (D) Tooth decay

9. Which is the most widely used coagulant for the treatment of turbid water?
    (A) Alum (aluminium sulphate)
    (B) Lime
    (C) Ferric chloride
    (D) Sodium aluminate

10. Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.
    (A) Low amount of excess combustion air
    (B) Large quantity of excess combustion air
    (C) Hydrocarbon fuel
    (D) Pulverized coal as fuel

11. Higher concentration of nitrogen dioxide in atmospheric air causes
    (A) Cancer
    (B) Bronchitis
    (C) Asphyxiation
    (D) Corrosion

12. Biological oxidation ponds remove organic matters present in the polluted water by
    (A) Using the activities of bacteria and other micro organisms
    (B) Aerobic oxidation
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

13. Exposure to SO2 containing chimney gases results in the
    (A) Reduction in strength of leather & cloth
    (B) Acceleration of corrosion rates of metals
    (C) Increased drying & hardening time of paints
    (D) All (a), (b) and (c)

14. Pick out the correct statement.
    (A) Deforestation helps in controlling the green house effect
    (B) Global warming is detrimental for increase in food productivity and may cause flood and cyclone
    (C) Lightening discharges are natural source of production of SO2 & H2S pollutant
    (D) Sulphur dioxide causes death by asphyxiation

15. The principal gas evolved from sludge digestion tank is
    (A) CO
    (B) CO2
    (C) CH4
    (D) N2

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