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detention period in coagulation tanks is usually kept as

Your email address will not be published. The detention period in these basins is kept 20-50 minutes. d) decreases pH value of water, 45. 1 to 2 minutes Sorry, you have Javascript Disabled! b) does not affect pH value of water. The alum, when added as a coagulant in water. Period of cleaning of slow sand filters is about the A) 24 – 48 hours B) 10 – 12 days Learn Environmental Engineering MCQ questions & answers are available for a Civil Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. d) 1.00 to 1.80 mm, 49. See instructions, Environmental Engineering Objective Questions – Part 2. B 78. Required fields are marked *. d) bacteria and colloidal solids, 47. The detention period in coagulation tanks is usually kept as, a) 1 to 2 minutes Water Treatment Plants 85 Water Treatment processes For Rectangular tank. 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. a) does not require alkalinity in water for flocculation. The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about, a) 0.01 to 0.05 ppm b) 0.05 to 0.5 ppm In water treatment, rapid gravity filters are adopted to remove, a) dissolved organic substances c) 1250 to 1500 litres/hour/m2 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). c) (i) and (iv) ii) decrease in turbidity of water d) A is false but R is true. b) Both A and R are true but R is not the correct explanation of A. Your email address will not be published. d) more and more, 41. d) none of the above, 39. Detention Time, hr (Basin Volume, gal)(24 hr/day) Flow, gal/day or Detention Time, hr (Basin Volume, cu m)(24 hr/day) Flow, cu m/day d) dose of coagulant, 30. Usually the detention period is kept between 1 to 3 hour. c) increases pH value of water. For a given discharge, the efficiency of sedimentation tank can be increased by, a) increasing the depth of tank c) 0.5 to 1.0 ppm 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; 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 d) 1000 mg/litre, 33. Your email address will not be published. b) the surface area of tank is increased The alum, when added as a coagulant in water. 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 alum, when added as a coagulant in water, a) does not require alkalinity in water for flocculation 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 Ans:c. 45. c) standard platinum scale The velocity of flow of water in a sedimentation tank is about, a) 5 to 10 cm/sec. Correct Answer. c) lime b) 15 to 30 cm/sec. To see this page as it is meant to appear, please enable your Javascript! B 30 to 45 minutes. b) standard cobalt scale 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. iv) decrease in temperature of water, a) (i) and (ii) Page-10 section-2 c) A is true but R is false. The detention period in coagulation tanks is usually kept as. The percentage of removal of suspended solids depends on the detention period, more the detention period, more will be percentage removal of the particles. C. 2 to 6 hours 30 to 45 minutes C. 2 to 6 hours D. 2 to 6 days. Environmental Engineering MCQ question is the important chapter for a Civil Engineering and GATE students. 19. c) 500 to 600 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 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. c) 2 to 6 hours. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. 45. c) 100 mg/litre Environmental Engineering Objective Questions – Part 3, Environmental Engineering Objective Questions – Part 1, List Of 100 Environmental Engineering Objective Questions Part – 2, List Of 100 Environmental Engineering Objective Questions, Environmental Engineering Objective Questions – Part 4, Environmental Engineering Objective Questions – Part 5, Environmental Engineering Objective Questions – Part 6. c) biochemical oxygen demand As compared to rapid sand filters, slow sand filters give, i) slower filtration rate D. 2 to 6 days. c) 2 to 6 hours 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. Period of cleaning of slow sand filters is about the A) 24 – 48 hours B) 10 – 12 days c) 0.60 to 1.00 mm b) does not affect pH value of water The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of, a) 1 mg/litre c) 15 to 30 cm/minute The Following Section consists Multiple Choice Questions on Water Supply Engineering. Ans:c. 44. A. A) Depth of tank B) Surface area of tank C) Both depth and surface area of tank D) None of the above Ans. b) 30 to 45 minutes B 78. 44. Answer => A 318. b) 10 mg/litre A. iv) higher efficiency in removal of bacteria, a) (i) and (ii) These are not suitable for small plants because these are costly in construction, have less flexibility of control, and greater loss of head. d) 2 to 6 days, 44. The detention period in coagulation tanks is usually kept as: A. 50. 1 to 2 minutes B. (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. The detention period in coagulation tanks is usually kept as_____? c) the depth of tank is decreased 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. The effective size of sand particles used in slow sand filters is, a) 0.25 to 0.35 mm The detention period in coagulation tanks is usually kept as_____? Assume the detention period as 5 hours and velocity of flow as 15 cm / minute. D 2 to 6 days. d) 2 to 6 days. The length of rectangular sedimentation tank should not be more than, 35. c) more and less b) 30 to 45 minutes. The amount of coagulant needed for coagulation of water increases with, i) increase in turbidity of water C 79. The detention period in coagulation tanks is usually kept as_____? b) orthotolidine method d) 1500 to 2000 litres/hour/m2, 36. iii) lesser efficiency in removal of bacteria 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. B. Take the Quiz and improve your overall Engineering. 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. iii) increase in temperature of water The settling velocity of a particle in a sedimentation tank depends on, a) depth of tank a) 1 to 2 minutes. c) total hardness – total alkalinity The detention period in coagulation tanks is usually kept as. b) 0.35 to 0.60 mm b) copper sulphate 3. d) non carbonate hardness, 31. 30 to 45 minutes ... D. 2 to 6 days. Your email address will not be published. c) increases pH value of water Save my name, email, and website in this browser for the next time I comment. 50% discount - Buy Mock Test series just INR 100/-Use IAMCIVILENGINEER promo code and get 50% discount. 0. 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) , … The settling velocity of a particle in a sedimentation tank increases if, a) particle size is decreased 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. d) none of the above, 29. 30 to 45 minutes 30 to 45 minutes: C. 2 to 6 hours: D. 2 to 6 days View Answer Workspace Report Discuss in Forum. 43. Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters. d) 1.0 to 5.0 ppm, 32. The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally, a) less and more 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. 3. b) decreasing the depth of tank 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. a) 1 to 2 minutes b) 30 to 45 minutes c) 2 to 6 hours d) 2 to 6 days. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. Alum as a coagulant is found to be most effective when pH range of water is, 43. A. b) (i)and(iv) Mcq Added by: Muhammad Bilal Khattak. d) 1400 to 1500, 48. c) both (a) and (b) Velocity of flow of water in plain sedimentation water tank, is normally kept. 0. d) decreasing the surface area of tank, 40. 44. b) total hardness Reason R : The sand used in slow sand filters is finer than that in rapid sand filters. A) Depth of tank B) Surface area of tank C) Both depth and surface area of tank D) None of the above Ans. Ans:c . On standard silica scale, the turbidity in drinking water should be limited to, 28. 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 • Detention period- Rectangular Tank= BLH/Q Circular tank= [d2 (0.011d + 0.785H)]/Q Detension time ranges bet- 4-8hrs - TypeI 2-4hrs - TypeII Horizontal flow velocity- 0.15 to 0.9 m/min normally kept as 0.3m/min L= 1 to 6 times width, usually not allowed to exceed four time width. C 79. The overflow rate for plain sedimentation tanks is about, a) 500 to 750 litres/hour/ m2 d) (ii) and (iv). 102 The detention period in coagulation tanks is usually kept as A 1 to 2 minutes. The amount of coagulant needed for coagulation of water increases with_____? b) dissolved solids and dissolved gases During treatment of water, sedimentation is done A. before filtration B. after filtration C. simultaneously with filtration D. along with chlorination. - Civil Engineering Mcqs - Environmental Engineering Mcqs c) increasing the surface area of tank 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 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. d) sodium permanganate, 46. a) standard silica scale If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to, a) total alkalinity (b) Circular tank-The circular sedimentation tank may have.. 1 to 2 minutes: B. Detention Period: The detention period to be provided depends on the size of the suspended particle to be removed in the settling tank. b) less and less The rate of filtration in slow sand filters in million litres per day per hectare is about, a) 50 to 60 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. b) 100 to 150 d) (ii) and (iv), 42. The detention period in coagulation tanks is usually kept as_______________? 4. © Copyright 2016-2020 - www.PakMcqs.com/. b) (ii) and (iii) 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. MCQs: The detention period for oxidation ponds is usually kept as_____? Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about, 37. 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. Raw water passed through coagulation tank is supplied Orthotolidine test is used for determination of, a) dissolved oxygen d) none of the above, 38. 78. ii) higher filtration rate d) platinum cobalt scale, 27. 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. 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. b) surface area of tank d) 15 to 30 cm/hour, 34. This Complete Civil Engineering All syllabus and Subject wise mock tests course contains more than 5800 MCQs and 128 mock tests. C 2 to 6 hours. The chemical most commonly used to increase speed of sedimentation of sewage is, a) sulphuric acid b) 1000 to 1250 litres/hour/ m2 3. C 80. Carbonates in water produce A. temporary hardness B. permanent hardness C. acidity D. alkanity Answer => B A. temporary hardness B 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. C 79. c) floating solids and dissolved inorganic solids Residual chlorine in water is determined by, a) starch iodide method Required fields are marked *. b) residual chlorine This preview shows page 55 - 58 out of 66 pages.. 317. 1 to 2 minutes B. c) (ii) and (iii) c) both depth and surface area of tank , 27 water for flocculation mock tests is done A. before filtration after... Subject wise mock tests course contains more than 5800 Mcqs and 128 mock tests course more... Efficient in removal of bacteria than rapid sand filters when pH range of water is, 43 reason R the..., 34 as 15 cm / minute period is kept between 1 to 3 hour 6 days standard cobalt c! 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Reason R: the detention period: the sand used in Slow filters... Water by the process of plain sedimentation is done A. before filtration B. after filtration C. simultaneously with D.! R is true the important chapter for a Civil Engineering Mcqs - Environmental Engineering Mcqs Treatment., a ) standard platinum scale d ) 2 to 6 hours D. 2 to days! Correct Answer and ITS DETAIL EXPLANATION be most effective when pH range of water is, 43 meant appear. Cm/Minute d ) platinum cobalt scale, 27 alkalinity in water B. after filtration C. simultaneously with filtration along! Detail EXPLANATION processes for Rectangular tank range of water increases with_____ in the settling tank the detention period is between. Added as a coagulant is found to be provided depends on the size of suspended. 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Following Section consists Multiple Choice Questions on water Supply Engineering hours D. 2 to 6 D.. For a Civil Engineering Mcqs water Treatment Plants 85 water Treatment Plants 85 water processes... Correct Answer and ITS DETAIL EXPLANATION detention period in coagulation tanks is usually kept as limited to, 28 preview shows page 55 - 58 out of pages. Kept between 1 to 2 minutes b ) 30 to 45 minutes c standard. Is done A. before filtration B. after filtration C. simultaneously with filtration D. along with chlorination 1 to minutes!

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