Environmental Engineering

51.Dust collection efficiency of a cyclone separator depends upon its

1. Diameter
2. Inlet gas velocity
3. Overall height
4. All (A), (B)&(C)

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52.Ethanolamine is an absorbent used for the removal of _________ from air/gas.

1. HF
2. SO₂
3. H2S
4. Both (B)&(C)

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53.Exposure to chemicals having carcinogenic properties cause

1. Dermatitis (skin disorder)
2. Cancer
3. Asphyxiation
4. Asthma

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54.Exposure to small amount of _________ results in high blood pressure&heart disease in human beings.

1. Hydrogen sulphide
2. Mercury
3. Cadmium
4. Asbestos

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55.Exposure to SO₂ containing chimney gases results in the

1. Reduction in strength of leather&cloth
2. Acceleration of corrosion rates of metals
3. Increased drying&hardening time of paints
4. All (A), (B) and (C)

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56.Fine grit present in sewage is removed in the _________ during sewage treatment.

1. Grit chamber
2. Detritus tank
3. Trickling filter
4. Skimming tank

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57.Fluorosis (a bone disease) is caused by the presence of high concentration of _________ in atmospheric air.

1. Hydrocarbons
2. Hydrogen fluoride
3. Hydrogen sulphides
4. Nitrogen dioxide

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58.Fluorosis is caused due to the presence of excessive amount of _________ in drinking water.

1. Mercury
2. Lead
3. Fluoride
4. Arsenic

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59.Foaming and priming in boiler operation can be reduced by reduction in _________ in feed water.

1. Turbidity
2. Color (Hazen)
3. Total solids
4. All (A), (B)&(C)

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60.For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than _________ ppm.

1. 10000
2. 5
3. 500
4. 1000

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