Important RGPV Question
CE-602, Environmental Engineering-I,
VI Sem, CE
UNIT 1
Q.1) What are the various sources of water used in water supply schemes? Discuss their merits and demerits from quality and quantity point of view. (RGPV MAY 2024)
Q.2) Define Fire demand in the context of water supply systems. Explain the factors influencing fire demand and the methods used for its estimation. (RGPV MAY 2024)
Q.3) List and Explain about the various equations used to determine fire demand? (RGPV MAY 2023)
Q.4) A water supply scheme has to be designed for a city having a population of 1,20,000. Estimate the total draft (in MLD) which is required for an average water consumption of 220 lpcd. Use Kuichling’s method to calculate fire demand? (RGPV MAY 2023)
Q.5) Explain various methods to determine turbidity in given water sample? (RGPV MAY 2023)
Q.6) A water supply scheme has to be designed for a city having population of 1,00,000. For an average water consumption of 250 LPCD. Estimate: (RGPV MAY 2023)
i) Average daily demand ii) Maximum daily demand iii) Maximum hourly demand iv) Fire Demand as Per National Board of Fire under Writer’s Formula
Q.7) Discuss the important factors which affect the per capita demand of water supply. (RGPV MAY 2022)
Q.8) In a town, it has been decided to provide 200 litre of water per head per day in the 21th century. Estimate the domestic water requirement of this town in the year AD 2000 by projecting the population of the town by i) Arithmetic Increase Method ii) Incremental Increase Method (RGPV MAY 2022)
UNIT 2
Q.1) The population of a city in three consecutive years i.e. 1991, 2001, 2011 is 80,000; 250,000 and 480,000 respectively, Determine:
- i) The saturation population ii) The expected population in 2021. (RGPV MAY 2024)
Q.2) Elaborate about the factors governing the selection of the intake structure. (RGPV MAY 2024)
Q.3) What are intake structures? Explain about the working of canal intake? (RGPV MAY 2023)
Q.4) A city has a population of 1,50,000. Water is to be supplied at a rate of 160 litres per head per day. If the static lift of the pump is 40 metres, calculate the B.H.P of motor. The rising main is 300 m long and its diameter is 50 cm. Assume that motor efficiency is 85%, pump efficiency is 60%, f= 0.01 and peak hour demand is 1.5 times the average demand. (RGPV MAY 2023)
Q.5) Write a note on common impurities found in water. (RGPV MAY 2022)
Q.6) Describe in brief various tests conducted for chemical examination of water (minimum 4 tests). (RGPV MAY 2022)
UNIT 3
Q.1) Describe in brief various tests conducted for physical examination of water. (RGPV MAY 2024)
Q.2) Give a note on various water borne diseases. (RGPV MAY 2024)
Q.3) Draw a neat sketch of a slow sand filter. Explain its working. (RGPV MAY 2024)
Q.4) Describe in brief various types of sedimentation tanks generally used. (RGPV MAY 2024)
Q.5) Derive Stoke’s law for settlement of discrete particles in water. How do you modify the law, taking into account of the temperature effect? (RGPV MAY 2023)
Q.6) Define Coagulation. Write down the chemical reactions of aluminium sulphate and chlorinated copper as when used as coagulants. (RGPV MAY 2023)
Q.7) Describe the process of sedimentation with coagulation, as adopted in water treatment plants. Include in your answer the factors affecting coagulation also describe any two commonly used chemicals. (RGPV MAY 2022)
Q.8) A coagulation-sedimentation plant clarifies 50 million litre of water per day. The raw water has an alkalinity equivalent of 4 mg/l of CaCO3. The filter alum required at the plant is 20 mg/l. Determine the filter alum and the quick lime (containing 88% CaO required per year by the plant. Use the following molecular weights: Al = 27; S = 32 ; O = 16; H = 1; Ca = 40; C = 12. (RGPV MAY 2022)
Q.9) Describe the various considerations to be taken while planning and sitting a waste water treatment plant. (RGPV MAY 2022)
Q.10) List out the various forces responsible for filtration processes. Determine the expanded depth and backwash velocity for cleaning a filter with granular sand medium of size 0.4 mm, with a specific gravity of 2.65, depth of filter 0.67m with porosity 0.4, and filtering velocity 5m/hr. the shape factor is 0.85 and the porosity of expanded sand is 0.7. (RGPV MAY 2022)
UNIT 4
Q.1) Explain the theory of filtration as used in the purification of water. (RGPV MAY 2024)
Q.2) Discuss the role of sewerage systems in promoting public health, environmental protection and sustainable development. (RGPV MAY 2024)
Q.3) Discuss the different types of sewer networks and their suitability for various urban settings. (RGPV MAY 2024)
Q.4) Explain the construction techniques used for laying sewer pipelines. Discuss the importance of quality control and safety measures during sewer construction. (RGPV MAY 2024)
Q.5) With the help of neat sketches, explain Manholes and Lamp holes. (RGPV MAY 2023)
Q.6) Determine the surface overflow area for settling tank of 0.5 m³/sec flow using design overflow rate as 32.5 m³/m²/day. Also find the depth of the tank if detention time is 95 min. Assume L/B from 2/1 to 5/1 and length should not exceed 100 m. (RGPV MAY 2023)
Q.7) Explain in detail about the construction and laying of sewers? (RGPV MAY 2023)
Q.8) Calculate the velocity of flow and corresponding discharge in a sewer of circular section having diameter equal to 1 m laid at a gradient of 1 in 500. The sewer runs at a depth of 0.6 m. Use Manning’s formula taking n = 0.012? (RGPV MAY 2023)
Q.9) Describe 5 types of sewer appurtenances in detail. (RGPV MAY 2022)
Q.10) A population of 30,000 is residing in a town having an area of 60 hectares. If the average coefficient of runoff for this area is 0.60 and the time of concentration of the design rain is 30 minutes, calculate the discharge for which the sewer of a proposed combined system will be designed for the town in question. (Assume per capita water supply=135 lpcd and 80% of water supply is converted into sewage). (RGPV MAY 2022)
UNIT 5
Q.1) Define waste water and discuss its characteristics in terms of physical, chemical and biological parameters. Explain the significance of waste water analysis in understanding and managing water quality. (RGPV MAY 2024)
Q.2) Describe the processes involved in the decomposition of organic matter in waste water. (RGPV MAY 2024)
Q.3) Discuss the natural methods of waste water disposal, including land treatment and dilution in surface water bodies. (RGPV MAY 2024)
Q.4) What is Population equivalent? Calculate the population equivalent if the average standard BOD, of industrial sewage comes out to be 300 kg/day? (RGPV MAY 2023)
Q.5) Following observations were made on a 3% dilution of waste water. (RGPV MAY 2023)
DO of aerated water = 3mg/lit
DO of diluted water sample after 5 days of incubation 0.8 mg/lit
DO of waste water sample =0.6 mg/lit. Calculate 5 day BOD. Given KD = 0.1 per day.
Q.6) Write short note on disposal by dilution. Draw a neat sketch of Oxygen sag curve with labelling and also explain why oxygen sag curve is important? (RGPV MAY 2022)
Q.7) The BODs of waste water is 150 mg/l at 20°C. The K value is known to be 0.23 per day. What would BOD, be, if the test was run at 15°C. (RGPV MAY 2022)
Q.8) Design a rapid sand filters for a city having a population of 2,00,000 with rate of water supply 150 lpcd. Assume the rate of filtration is 4000 l/h/m², (RGPV MAY 2022)
Q.9) In two periods of each of 20 years, a city has grown from 30,000 (P0 at t0 = 0 ) to 1,70,000 (P1 at t1 = 20 years) and then to 3,00,000 (P₂ at t2 = 4 years). Determine
i) the saturation population ii) the equation of the logistic curve iii) the expected population after the next 20 years. (RGPV MAY 2022)
Q.10) A city discharges 1.25 m3/s of wastewater into a stream whose minimum rate of flow is 8 m3/s. The velocity of the stream is about 3.0 km/h. The temperature of the waste water is 20oC and that of the stream is 15oC The 20 oC BOD5 of the wastewater is 250 mg/L and that of the stream is 2 mg/L. The wastewater contains no dissolved oxygen, but the stream is flowing with saturated DO concentration of 9.2 mg/L. Saturated DO at 15 oC is 10.2 mg/L. At 20 oC, de-oxygenation constant (Kd) is estimated to be 0.3 per day and re-aeration constant (Ka) is 0.7 per day. Determine the critical oxygen deficit and its location. Also estimate the 20 oC BOD5 of a sample taken at the critical point. Use the temperature coefficients of ( ) 1.135 for Kd and 1.024 for Ka (RGPV MAY 2022)
EXTRA QUESTIONS
Q.1) Explain briefly about the following (any four) (RGPV MAY 2024)
i) Per capita demand of water ii) Infiltration gallery iii) Factors effecting sedimentation iv) Pumps and pumping stations v) Relative stability (RGPV MAY 2023)
Q.2) Write a short notes on any two: i) Sources of surface water ii) Disposal of sewage iii) Chemical parameters of sewage iv) Water borne diseases (RGPV MAY 2023)
— Best of Luck for Exam —
