Take the Quiz and improve your overall Engineering. The detention period in the coagulation tanks is usually kept as the A) 1 to 2 minutes B) 30 to 45 minutes C) 2 to 6 hours D) 2 to 6 days Ans. Answer => A 318. MCQs: The detention period for oxidation ponds is usually kept as_____? Alum as a coagulant is found to be most effective when pH range of water is, 43. iii) increase in temperature of water c) the depth of tank is decreased b) (ii) and (iii) In order to provide sufficiently quiescent conditions for effective sedimentation of the suspended solids, the minimum detention period for the sewage in a septic tank should be 24 hours. The amount of coagulant needed for coagulation of water increases with_____? B 30 to 45 minutes. 4. 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 Ans:c 44. B. b) residual chlorine Question is ⇒ The detention period in coagulation tanks is usually kept as, Options are ⇒ (A) 1 to 2 minutes, (B) 30 to 45 minutes, (C) 2 to 6 hours, (D) 2 to 6 days, (E) , … C 80. C 79. Your email address will not be published. 3. 1 to 2 minutes Assume the detention period as 5 hours and velocity of flow as 15 cm / minute. The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally, a) less and more d) decreases pH value of water, 45. 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 Ans:c 45. a) standard silica scale The chemical most commonly used to increase speed of sedimentation of sewage is, a) sulphuric acid d) dose of coagulant, 30. Velocity of flow of water in plain sedimentation water tank, is normally kept. The percentage of removal of suspended solids depends on the detention period, more the detention period, more will be percentage removal of the particles. Select your answer based on the coding system given below: a) Both A and R are true and R is the correct explanation of A. D. 2 to 6 days. b) (i)and(iv) The sedimentation tanks may be of the following types-(a) Rectangular Sedimentation Tank-In this type of tank, its capacity depends upon the volume of water. 50) Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.Reason R : The sand used in slow sand filters is finer than that in rapid sand If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to, a) total alkalinity c) (i) and (iv) C 79. d) none of the above, 38. (b) Circular tank-The circular sedimentation tank may have.. Residual chlorine in water is determined by, a) starch iodide method Water Treatment Plants 85 Water Treatment processes For Rectangular tank. b) 10 mg/litre - Civil Engineering Mcqs - Environmental Engineering Mcqs a) does not require alkalinity in water for flocculation. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. 19. b) orthotolidine method b) copper sulphate b) does not affect pH value of water. Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about, 37. © Copyright 2016-2020 - www.PakMcqs.com/. b) does not affect pH value of water c) total hardness – total alkalinity d) (ii) and (iv). b) the surface area of tank is increased The alum, when added as a coagulant in water. c) more and less 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 Ans:c. 45. d) 2 to 6 days, 44. d) none of the above, 29. 43. For a given discharge, the efficiency of sedimentation tank can be increased by, a) increasing the depth of tank Usually the detention period is kept between 1 to 3 hour. The alum, when added as a coagulant in water, a) does not require alkalinity in water for flocculation d) (ii) and (iv), 42. c) both depth and surface area of tank 44. b) 15 to 30 cm/sec. d) decreasing the surface area of tank, 40. The amount of coagulant needed for coagulation of water increases with, i) increase in turbidity of water 44. b) less and less In storage reservoirs, detention time is the length of time entering water will be held before being drafted for use (several weeks to years, several months being typical). DESIGN ASPECTS 42 ♦Design Summary of Coagulation Tank: •No of tanks = 4 •Type of tank = Circular •Removal of sludge and scum = Mechanical •Diameter of tank, d = 18 m •Detention time, t = 2 hours •Depth of free board = 0.5 m •Sludge zone accumulation = 1 m •Total Depth of tank, D = 6.5 m Altafayaz2161@gmail.com 43. This preview shows page 55 - 58 out of 66 pages.. 317. C 2 to 6 hours. This Complete Civil Engineering All syllabus and Subject wise mock tests course contains more than 5800 MCQs and 128 mock tests. A. B 78. The rate of filtration in slow sand filters in million litres per day per hectare is about, a) 50 to 60 PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. 30 to 45 minutes: C. 2 to 6 hours: D. 2 to 6 days View Answer Workspace Report Discuss in Forum. d) A is false but R is true. ii) decrease in turbidity of water iv) decrease in temperature of water, a) (i) and (ii) 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 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. Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters. Sedimentation refers to the removal of suspended matter in water by allowing it to stand still in a quiescent pond for period known as 'detention period' Coagulation refers to the addition of a chemical called "coagulant" that traps the very finely suspended particles (that do not settle easily) in a gel. Ans:c. 44. 1 to 2 minutes B. See instructions, Environmental Engineering Objective Questions – Part 2. The detention period in coagulation tanks is usually kept as. The settling velocity of a particle in a sedimentation tank increases if, a) particle size is decreased c) 0.5 to 1.0 ppm Save my name, email, and website in this browser for the next time I comment. To see this page as it is meant to appear, please enable your Javascript! d) non carbonate hardness, 31. c) 500 to 600 Correct Answer. c) 2 to 6 hours. c) 0.60 to 1.00 mm d) 1.0 to 5.0 ppm, 32. d) 1400 to 1500, 48. b) 1000 to 1250 litres/hour/ m2 c) 1250 to 1500 litres/hour/m2 Environmental Engineering MCQ question is the important chapter for a Civil Engineering and GATE students. The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of, a) 1 mg/litre 30 to 45 minutes ... D. 2 to 6 days. Required fields are marked *. View Answer Answer: 2 to 6 hours 103 The alum, when added as a coagulant in water A does not require alkalinity in water for flocculation. The alum, when added as a coagulant in water a) does not require alkalinity in water for flocculation b) does not affect pH value of water c) increases pH value of water d) decreases pH value of water Ans:d 46. 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 Ans:c 45. d) bacteria and colloidal solids, 47. 50. a) 1 to 2 minutes. Ans:c . In water treatment, rapid gravity filters are adopted to remove, a) dissolved organic substances b) standard cobalt scale 0. The overflow rate for plain sedimentation tanks is about, a) 500 to 750 litres/hour/ m2 c) (ii) and (iii) c) lime As compared to rapid sand filters, slow sand filters give, i) slower filtration rate The settling velocity of a particle in a sedimentation tank depends on, a) depth of tank A. iii) lesser efficiency in removal of bacteria Carbonates in water produce A. temporary hardness B. permanent hardness C. acidity D. alkanity Answer => B A. temporary hardness B Mcq Added by: Muhammad Bilal Khattak. The detention period in coagulation tanks is usually kept as_____? The detention period in coagulation tanks is usually kept as. d) 1500 to 2000 litres/hour/m2, 36. d) platinum cobalt scale, 27. c) 2 to 6 hours 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 Ans:c. 45. The detention period in coagulation tanks is usually kept as_______________? The velocity of flow of water in a sedimentation tank is about, a) 5 to 10 cm/sec. Reason R : The sand used in slow sand filters is finer than that in rapid sand filters. b) surface area of tank b) Both A and R are true but R is not the correct explanation of A. During treatment of water, sedimentation is done A. before filtration B. after filtration C. simultaneously with filtration D. along with chlorination. b) 0.05 to 0.5 ppm b) 100 to 150 c) biochemical oxygen demand c) both (a) and (b) d) none of the above, 39. A. d) 1.00 to 1.80 mm, 49. However, considering the volume required for sludge and scum accumulation, a septic tank is usually designed for a detention period of 24 to 48 hours. 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 Ans:c 45. 78. The alum, when added as a coagulant in water a) does not require alkalinity in water for flocculation b) does not affect pH value of water c) increases pH value of water d) decreases pH value of water Ans:d 46. B 78. 102 The detention period in coagulation tanks is usually kept as A 1 to 2 minutes. c) A is true but R is false. Sorry, you have Javascript Disabled! d) 2 to 6 days. C 79. Period of cleaning of slow sand filters is about the A) 24 – 48 hours B) 10 – 12 days C) 2 – 3 months D) 1 – 2 year Ans. Detention Period: The detention period to be provided depends on the size of the suspended particle to be removed in the settling tank. The length of rectangular sedimentation tank should not be more than, 35. The Following Section consists Multiple Choice Questions on Water Supply Engineering. C. 2 to 6 hours The detention period in these basins is kept 20-50 minutes. The alum, when added as a coagulant in water. c) 15 to 30 cm/minute Period of cleaning of slow sand filters is about the A) 24 – 48 hours B) 10 – 12 days 0. c) increases pH value of water. The alum, when added as a coagulant in water a) does not require alkalinity in water for flocculation b) does not affect pH value of water c) increases pH value of water d) decreases pH value of water Ans:d 46. 50% discount - Buy Mock Test series just INR 100/-Use IAMCIVILENGINEER promo code and get 50% discount. (adsbygoogle = window.adsbygoogle || []).push({}); PakMcqs.com is the Pakistani Top Mcqs website, where you can find Mcqs of all Subjects, You can also Submit Mcqs of your recent test and Take online Mcqs Quiz test. 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