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
- (A) Degradation
- (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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