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- Question
In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time
Options- A. 100 mm dia.
- B. 150 mm dia.
- C. 225 mm dia.
- D. all of these.
- Correct Answer
- 225 mm dia.
- 1. The ratio of depths at partial flow with central angle ? and at full flow of a sewer, is
Options- A.
- B.
- C.
- D.
- E.
Discuss
- 2. If the grit in grit chambers is 4.5 million litres per day, its cleaning is done
Options- A. manually
- B. mechanically
- C. hydraulically
- D. electrically. Discuss
- 3. If D is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is
Options- A. 1.250 D
- B. 1.350 D
- C. 1.425 D
- D. 1.625 D. Discuss
- 4. The stone ware sewers
Options- A. are used for carrying sewage and drainage from houses
- B. are manufactured from clays and shales
- C. after casting are dried and burnt at temperature 150°C, 700°C and 1200°C
- D. are generally provided with a water proof cover by vaporising sodium chloride
- E. all the above. Discuss
- 5. The sewer which received discharge from two or more main sewers, is known as
Options- A. a trunk sewer
- B. an outfall sewer
- C. a main sewer
- D. an intercepting sewer. Discuss
- 6. Pick up the correct statement from the following :
Options- 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. Two sewers of different shapes are said to be hydraulically equivalent if they discharge at the same rate while running full on the same grade
- E. All the above. Discuss
- 7. Kjedahl nitrogen is a mixture of
Options- A. ammonia and nitrogen
- B. nitrogen and organic nitrogen
- C. organic nitrogen and ammonia
- D. all the above. Discuss
- 8. In sewers the velocity of flow should not be
Options- 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. Discuss
- 9. Traps
Options- A. are water seals which prevent the entry of foul gases
- B. are used to trap the rats entering sewers
- C. dissolve the foul gases
- D. create syphonic action to increase the quick disposal of sewerage. Discuss
- 10. Assertion (A) : A free board of 0.3 m is provided above the top sewage line in septic tanks.
Reason (R) : It helps to accommodate the scum in the septic tank.
Options- A. Both A and R are true and R is the correct explanation of A
- B. Both A and R are true but R is not a correct explanation of A
- C. A is true but R is false
- D. A is false but R is true. Discuss
Waste Water Engineering problems
Search Results
Correct Answer:
Correct Answer: manually
Correct Answer: 1.625 D.
Correct Answer: all the above.
Correct Answer: a trunk sewer
Correct Answer: All the above.
Correct Answer: all the above.
Correct Answer: less than the self-cleansing velocity
Correct Answer: are water seals which prevent the entry of foul gases
Correct Answer: Both A and R are true and R is the correct explanation of A
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