MCQ-Water Supply and Wastewater Engineering - Set 05 - ObjectiveBooks
MCQ-Water Supply and Wastewater Engineering - Set 05

MCQ-Water Supply and Wastewater Engineering - Set 05

Practice Test: Question Set - 05

1. The sludge does not contain waste water from
    (A) Bath rooms
    (B) Wash basins
    (C) Kitchen sinks
    (D) Toilets
2. In sewers the velocity of flow should not be
    (A) More than the self-cleansing velocity
    (B) Less than the self-cleansing velocity
    (C) Less than 10 m/sec
    (D) More than 20 m/sec
3. Pick up the correct statement from the following:
    (A) Hydrogen sulphide gas in excess, may cause corrosion of concrete sewers
    (B) 4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river
    (C) Solubility of oxygen in sewage is 95% of that of distilled water
    (D) All the above
4. In sewers the effect of scouring is more on
    (A) Top side
    (B) Bottom side
    (C) Horizontal side
    (D) All sides
5. The rainfall at any place may be determined by
    (A) Its intensity
    (B) Its direction
    (C) Its frequency
    (D) All the above
6. Pick up the correct statement from the following:
    (A) The circular section of sewers provides maximum hydraulic mean depth
    (B) The circular sewers are provided for separate sewerage system
    (C) The circular sewers work efficiently if the sections run at least half full
    (D) All the above
7. Pick up the correct statement from the following:
    (A) Rate of digestion of sludge is more at higher temperature
    (B) Thermophilic organisms digest the sludge if the temperature ranges from 40° to 60°C
    (C) Mesophilic organisms digest the sludge if the temperature is between 25° and 40°C
    (D) All the above
8. Sewer ventilating columns are generally placed at
    (A) Distances 150 m to 300 m
    (B) Upper ends of branch sewers
    (C) Every change in the size of sewers
    (D) All the above
9. The sewer which resists sulphide corrosion, is
    (A) Brick sewer
    (B) Cast iron sewer
    (C) R.C.C. sewer
    (D) Lead sewer
10. In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is
    (A) Q/(B × D)
    (B) Q/(L × D)
    (C) Q/L
    (D) Q/(B × L)
11. The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning's formula, is given by
    (A) Bazin
    (B) Crimp and Bruges
    (C) William-Hazen
    (D) Kutter
12. The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known
    (A) Bio-Chemical Oxygen Demand (B.O.D.)
    (B) Dissolved Oxygen (D.O.)
    (C) Chemical Oxygen Demand (C.O.D.)
    (D) None of these
13. Water content of sewage is about
    (A) 90 %
    (B) 95 %
    (C) 99 %
    (D) 9.9 %
14. Skimming tanks are
    (A) Used to remove the grease and oil
    (B) Those from which sludge is skimmed out
    (C) Tanks provided with self-cleansing screens
    (D) Improved version of grit chambers
15. The most efficient cross-section of sewers in a combined sewerage system is
    (A) Parabolic
    (B) Circular
    (C) Rectangular
    (D) New egged
Show and hide multiple DIV using JavaScript View All Answers

 Next Tests: