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Environmental Engineering - Interview Questions and Answers

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1. The type of valve, which is provided on the suction pipe in a tube-well, is
A. air relief valve
B. reflux valve
C. pressure relief valve
D. sluice valve
Explanation:
2. The suitable method of forecasting population for a young and rapidly increasing city is
A. arithmetical increase method
B. geometrical increase method
C. incremental increase method
D. graphical method
Explanation:
3. The type of sewer which is suitable for both combined and separate system is
A. circular sewer
B. egg shaped sewer
C. horse-shoe type sewer
D. semi-elliptical sewer
Explanation:
4. Laying of sewers is usually done with the help of
A. a theodolite
B. a compass
C. sight rails and boning rods
D. a plane table
Explanation:
5. 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
A. 100 ppm
B. 200 ppm
C. 300 ppm
D. 400 ppm
Explanation:
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