Waste Water Engineering problems
- 1. The coagulant widely used for sewage treatment, is
Options- A. alum
- B. ferric chloride
- C. ferric sulphate
- D. chlorinated copperas. Discuss
Correct Answer: ferric chloride
- 2. The gas which may cause explosion in sewers, is
Options- A. carbondioxide
- B. methane
- C. ammonia
- D. carbon monoxide. Discuss
Correct Answer: methane
- 3. Assertion (A) : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable.
Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities.
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
Correct Answer: Both A and R are true and R is the correct explanation of A
- 4. In a fully mechanised composting plant, involves
Options- A. mechanized receipt
- B. mechanized segregation
- C. mechanized pulverising of refuse
- D. all of these. Discuss
Correct Answer: all of these.
- 5. In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is
Options- A. 2.25
- B. 2.50
- C. 2.55
- D. 2.65
- E. 2.75 Discuss
Correct Answer: 2.65
- 6. For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is
Options- A. cast iron sewers
- B. cement concrete sewers
- C. glazed bricks sewers
- D. stone ware sewers. Discuss
Correct Answer: glazed bricks sewers
- 7. If D is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is
Options- A. D
- B. 1.25 D
- C. 1.5 D
- D. 1.75 D
- E. 2 D. Discuss
Correct Answer: 1.5 D
- 8. When drainage to sewage ratio is 20, the peak dry weather flow is
Options- A. 20% of the design discharge
- B. slightly less than 5% of the design discharge
- C. slightly more than 5% of the design discharge
- D. none of these. Discuss
Correct Answer: slightly less than 5% of the design discharge
- 9. A rain sanitary sewer is constructed to carry
Options- A. sanitary sewage
- B. storm sewage
- C. surface water
- D. ground water
- E. all the above. Discuss
Correct Answer: sanitary sewage
- 10. For the COD test of sewage, organic matter is oxidised by K2Cr207 in the presence of
Options- A. H2SO4
- B. HNO3
- C. HCl
- D. none of these. Discuss
Correct Answer: H2SO4
More in Civil Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.