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.

Environmental Engineering in CE
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.

70

30

100

3

70

30

100

3

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Environmental Engineering in CE
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of

Ozone and iodine

All of these

Chlorine or its compounds

Ultraviolet light for irradiation of water

Ozone and iodine

All of these

Chlorine or its compounds

Ultraviolet light for irradiation of water

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Environmental Engineering in CE
World environment day is observed every year on the 5th of

June

December

July

September

June

December

July

September

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Environmental Engineering in CE
Tri-sodium phosphate is used in boiler water treatment to reduce

Caustic embrittlement

Suspended silica

Dissolved oxygen

Turbidity

Caustic embrittlement

Suspended silica

Dissolved oxygen

Turbidity

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Environmental Engineering in CE
Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

Nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate

Coagulation and flocculation of colloids

Oxidation of carbonaceous matter to CO₂

All of these

Nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate

Coagulation and flocculation of colloids

Oxidation of carbonaceous matter to CO₂

All of these

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Environmental Engineering in CE
Water filtration rate in a slow sand filter ranges from __________ litres/m²/hr.

100 to 200

4000 to 5000

1500 to 2500

10 to 20

100 to 200

4000 to 5000

1500 to 2500

10 to 20

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Environmental Engineering in CE

Environmental Engineering in CE 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.

Environmental Engineering in CE Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of

Environmental Engineering in CE World environment day is observed every year on the 5th of

Environmental Engineering in CE Tri-sodium phosphate is used in boiler water treatment to reduce

Environmental Engineering in CE Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

Environmental Engineering in CE Water filtration rate in a slow sand filter ranges from __________ litres/m²/hr.

Environmental Engineering in CE
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.

Environmental Engineering in CE
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of

Environmental Engineering in CE
World environment day is observed every year on the 5th of

Environmental Engineering in CE
Tri-sodium phosphate is used in boiler water treatment to reduce

Environmental Engineering in CE
Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

Environmental Engineering in CE
Water filtration rate in a slow sand filter ranges from __________ litres/m²/hr.