Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal

Environmental Engineering in CE
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal

By chemical coagulation

In clarifiers

In vacuum filter

In sedimentation tanks equipped with mechanical scrapper

By chemical coagulation

In clarifiers

In vacuum filter

In sedimentation tanks equipped with mechanical scrapper

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Environmental Engineering in CE
Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan

Neither A nor B

With greater number of blades

Of increased diameter

Both A & B

Neither A nor B

With greater number of blades

Of increased diameter

Both A & B

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Environmental Engineering in CE
Hardy cross method of analysis of distribution system(i) Involves successive trials(ii) Takes economic aspects into account(iii) Is time consuming

(i) and (iii)

All are correct

Only (i)

(i) and (ii)

(i) and (iii)

All are correct

Only (i)

(i) and (ii)

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Environmental Engineering in CE
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is

None of these

Left as such without any treatment

Diluted with fresh water to reduce its acidity

Neutralised by alkali treatment

None of these

Left as such without any treatment

Diluted with fresh water to reduce its acidity

Neutralised by alkali treatment

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Environmental Engineering in CE
The resistance of water to the passage of light through it is a measure of the

Dissolved gases

Hardness

Color

Turbidity

Dissolved gases

Hardness

Color

Turbidity

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Environmental Engineering in CE
TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.

1000

0.1

25

100

1000

0.1

25

100

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Environmental Engineering in CE

Environmental Engineering in CE Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal

Environmental Engineering in CE Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan

Environmental Engineering in CE Hardy cross method of analysis of distribution system(i) Involves successive trials(ii) Takes economic aspects into account(iii) Is time consuming

Environmental Engineering in CE Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is

Environmental Engineering in CE The resistance of water to the passage of light through it is a measure of the

Environmental Engineering in CE TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.

Environmental Engineering in CE
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal

Environmental Engineering in CE
Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan

Environmental Engineering in CE
Hardy cross method of analysis of distribution system(i) Involves successive trials(ii) Takes economic aspects into account(iii) Is time consuming

Environmental Engineering in CE
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is

Environmental Engineering in CE
The resistance of water to the passage of light through it is a measure of the

Environmental Engineering in CE
TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.