Civil Engineering - Waste Water Engineering

41. 

The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

A. 213.5 cm/sec
B. 313.5 cm/sec
C. 413.5 cm/sec
D. 500 cm/sec.

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

42. 

If γw is the unit weight of water, r the hydraulic mean depth of the sewer and S the bed slope of the sewer, then the tractive force exerted by flowing water, is

A. γw . r . S
B. γw r1/2 . S
C. γw r S
D. γw r2/3 S

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

43. 

In detritus tanks,

A. flow velocity is kept 0.09 m/sec
B. detention period is kept 3 to 4 minutes
C. organic and inorganic materials are separated
D. all the above.

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

44. 

The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is

A. 5 m
B. 5.5 m
C. 6 m
D. 6.5 m
E. 7 m.

Answer: Option E

Explanation:

No answer description available for this question. Let us discuss.

45. 

In areas where rainy season is limited to a few months, the type of sewerage system recommended is

A. combined system
B. partially separate system
C. separate system
D. none of these.

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.