Environmental Engineering Interview Questions Answers - Set 03 - ObjectiveBooks

Environmental Engineering Interview Questions Answers - Set 03

Practice Test: Question Set - 03


1. The settling velocity of a particle in a sedimentation tank depends on
    (A) Depth of tank
    (B) Surface area of tank
    (C) Both depth and surface area of tank
    (D) None of the above

2. The detention period in coagulation tanks is usually kept as
    (A) 1 to 2 minutes
    (B) 30 to 45 minutes
    (C) 2 to 6 hours
    (D) 2 to 6 days

3. Period of cleaning of slow sand filters is about
    (A) 24 - 48 hours
    (B) 10 - 12 days
    (C) 2 - 3 months
    (D) 1 - 2 year

4. The process in which the chlorination is done beyond the break point is known as
    (A) Pre-chlorination
    (B) Post chlorination
    (C) Super chlorination
    (D) Break point chlorination

5. Disinfection efficiency is
    (A) Reduced at higher pH value of water
    (B) Unaffected by pH value of water
    (C) Increased at higher pH value of water
    (D) Highest at pH value equal to 7

6. The suitable layout of a distribution system for irregularly growing town is
    (A) Dead end system
    (B) Grid iron system
    (C) Radial system
    (D) Ring system

7. A sewer that receives the discharge of a number of house sewers is called
    (A) House sewer
    (B) Lateral sewer
    (C) Intercepting sewer
    (D) Sub-main sewer

8. The time of concentration is defined as
    (A) The time taken by rainfall water to run from most distant point of water shed to the inlet of sewer
    (B) The time required for flow of water in sewer to the point under consideration
    (C) Sum of (A) and (B)
    (D) Difference of (A) and (B)

9. Most suitable section of sewer in separate sewage system is
    (A) Rectangular section
    (B) Circular section
    (C) Standard form of egg shaped sewer
    (D) Modified egg shaped section

10. The pathogens can be killed by
    (A) Nitrification
    (B) Chlorination
    (C) Oxidation
    (D) None of the above

11. The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is
    (A) 1 ppm
    (B) 4 ppm
    (C) 10 ppm
    (D) 40 ppm

12. If the sewage contains grease and fatty oils, these are removed in
    (A) Grit chambers
    (B) Detritus tanks
    (C) Skimming tanks
    (D) Sedimentation tanks

13. Composting and lagooning are the methods of
    (A) Sludge digestion
    (B) Sludge disposal
    (C) Sedimentation
    (D) Filtration

14. The gas from sludge digestion tank is mainly composed of
    (A) Nitrogen
    (B) Carbon dioxide
    (C) Hydrogen sulphide
    (D) Methane

15. Assertion A: The consumption of water increases with increase in the distribution pressure.
Reason R: Higher distribution pressure causes more loss and waste of water
Select your answer according to the coding system given below
    (A) Both A and R is true and R is the correct explanation of A
    (B) Both A and R is true but R is not the correct explanation of A
    (C) A is true but R is false
    (D) A is false but R is true

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