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Environmental Engineering

Environmental Engineering
The percentage of chlorine in fresh bleaching powder is about

20 to 25
10 to 15
30 to 35
40 to 50

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Environmental Engineering
The design discharge for the combined sewer system shall be taken as

Rainfall + 6 DWF
Equal to rainfall
Rainfall + 2 DWF
Rainfall + DWF

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Environmental Engineering
The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is

Safety valve
Sluice valve
Scour valve
Check valve

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Environmental Engineering
In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be

300 ppm
100 ppm
400 ppm
200 ppm

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Environmental Engineering
The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about

0.05 to 0.5 ppm
1.0 to 5.0 ppm
0.01 to 0.05 ppm
0.5 to 1.0 ppm

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Environmental Engineering
Corrosion in concrete sewers is caused by

Nitrogen
Chlorine
Dissolved oxygen
Septic conditions

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MORE MCQ ON Environmental Engineering

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