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Environmental Engineering

Environmental Engineering
The velocity of flow does not depend on

Length of sewer
Grade of sewer
Roughness of sewer
Hydraulic mean depth of sewer

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Environmental Engineering
Which of the following retards the self purification of stream?

Higher temperature
Satisfying oxygen demand
Sunlight
None of these

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Environmental Engineering
The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is

Pressure relief valve
Reflux valve
Sluice valve
Air relief valve

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Environmental Engineering
The disinfection efficiency of chlorine increases by (i) Decreasing the time of contact (ii) Decreasing the temperature of water (iii) Increasing the temperature of water

Only (i)
Both (i) and (ii)
Only (iii)
Both (i) and (iii)

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Environmental Engineering
Cleaning is done by (i) Scraping and removal in filters slow sand (ii) Back washing in slow sand filters (iii) Scraping and removal in filters rapid sand (iv) Back washing in rapid sand filters The correct answer is

(ii) and (iii)
(ii) and (iv)
(i) and (iv)
(i) and (ii)

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Environmental Engineering
A sewer that receives the discharge of a number of house sewers is called

Lateral sewer
Sub-main sewer
House sewer
Intercepting sewer

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MORE MCQ ON Environmental Engineering

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