Civil Engineering - Waste Water Engineering

41. 

In septic tanks, decomposition of organic bacteria, is done by

A. anaerobic bacteria
B. aerobic bacteria
C. both types of bacterias
D. none of these.

Answer: Option A

Explanation:

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42. 

The stone ware sewers

A. are used for carrying sewage and drainage from houses
B. are manufactured from clays and shales
C. after casting are dried and burnt at temperature 150°C, 700°C and 1200°C
D. are generally provided with a water proof cover by vaporising sodium chloride
E. all the above.

Answer: Option E

Explanation:

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43. 

'Cowl' is provided at

A. lower end of ventilating column
B. upper end of ventilating column
C. upper end of the manhole
D. first step in manhole.

Answer: Option B

Explanation:

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44. 

The sewer which transports the sewage to the point of treatment, is called

A. house sewer
B. out-fall sewer
C. branch sewer
D. lateral
E. main sewer.

Answer: Option B

Explanation:

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45. 

Kjedahl nitrogen is a mixture of

A. ammonia and nitrogen
B. nitrogen and organic nitrogen
C. organic nitrogen and ammonia
D. all the above.

Answer: Option D

Explanation:

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