Civil Engineering Waste Water Treatment Questions Answers - Set 14 - ObjectiveBooks

# Practice Test: Question Set - 14

1. In case of sewer lines
(A) Water test is carried out to check water tightness of the joints
(B) Test for straightness is carried out with the help of a lamp and mirror
(C) Obstruction test is carried out with the help of smooth ball of diameter 13 mm
(D) All the above

2. The normal values of over flow rates for secondary sedimentation tanks, ranges between
(A) 25,000 to 35,000 liters/sqm/day
(B) 40,000 to 50,000 liters/sqm/day
(C) 50,000 to 60,000 liters/sqm/day
(D) 80,000 to 10,000 liters/sqm/day

3. A manhole is classified as shallow if its depth is between
(A) 0.4 to 0.5 m
(B) 0.5 to 0.7 m
(C) 0.7 to 0.9 m
(D) 0.9 to 1.20 m

4. The first stage of neutral process of sludge digestion, is
(A) Acid fermentation
(B) Acid regression
(C) Alkaline fermentation
(D) None of these

5. The stone ware sewers
(A) Are used for carrying sewage and drainage from houses
(B) Are manufactured from clays and shale
(C) After casting are dried and burnt at temperature 150°C, 700°C and 1200°C
(D) All the above

6. The formula V = (1/n) r2/3 √s used for determining flow velocities in sewers, is known as
(A) Chezy's formula
(B) Bazin's formula
(C) Kutter's formula
(D) Manning's formula

7. In sewers the highest non-scouring velocity is achieved in
(A) Glazed bricks sewers
(B) Cast iron sewers
(C) Cement concrete sewers
(D) Stone ware sewers

8. The maximum diameter of sewers adopted in the designs is
(A) 1.0 m
(B) 2.0 m
(C) 3.0 m
(D) 4.0 m

9. If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of
(B) Active decomposition
(C) Recovery
(D) Cleaner water

10. Facultative bacteria survive in
(A) The presence of oxygen
(B) The absence of oxygen
(C) Both cases (a) and (b)
(D) Neither (a) nor (b)

11. For trunk and out-fall, the type of sewers generally used, is
(A) Standard egg shaped
(B) Circular shaped
(C) Horse shoe shaped
(D) Parabolic shaped

12. The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is
(A) 20 m
(B) 30 m
(C) 45 m
(D) 75 m

13. The suitable cross-section of sewers to carry combined flow, is
(A) Circular
(B) Egg shaped
(C) Rectangular
(D) Horse shoe shaped

14. The underground sewers are more subjected to
(A) Tensile force
(B) Compressive force
(C) Bending force
(D) Shearing force

15. The minimum recommended diameter of sewers, is
(A) 5 cm
(B) 10 cm
(C) 15 cm
(D) 20 cm

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