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Environmental Engineering in CE

Environmental Engineering in CE
The most commonly used chemical coagulant in water treatment is

Alum
Hydrazine
Ferrous sulphate
Lime

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Environmental Engineering in CE
Dust collection efficiency of a cyclone separator depends upon its

Overall height
Diameter
All of these
Inlet gas velocity

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Environmental Engineering in CE
Inhalation of silica dust causes a disease called

Pneumoconiosis
Silicosis
Bronchitis
None of these

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Environmental Engineering in CE
The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the

None of these
Ionosphere
Troposphere
Stratosphere

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Environmental Engineering in CE
Corrosion in boilers can be prevented by

Deaeration of feed water
Enhancing pH of feed water by adding alkali
Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion
All of these

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Environmental Engineering in CE
During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum?

Cruising
Acceleration
Deaccelaration
Idle running

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