Exam Details
| Subject | Environmental Engineering | |
| Paper | ||
| Exam / Course | Diploma in Civil Engineering (DCLE) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2016 | |
| City, State | new delhi, |
Question Paper
No. of Printed Pages: 5 IBCE-0331
DIPLOMA IN CIVIL ENGINEERING DCLE(G) I DCLEVI Tenn-EndExanrlnanon 00343 December, 2016
BCE-033 ENVIRONMENTAL ENGINEERING
Time hours Maximum Marks: 70
Note: Attempt five questions in all. Question no. 1 is compulsory. All questions carry equal marks. Assume any missing data suitably.
1. Choose the ,most appropriate alternative in the following questions: 6xl=6
The average domestic water consumption per capita per day for an Indian city provided with piped water supply and sewage system is taken as
135
210
240
270
Ground water is usually free from
Suspended impurities
Dissolved impurities
Both and
None of these
The usual life of cast iron pipes under normal conditions is about
25 years
50 years
100 years
75 years
Hardness of water is caused due to
Calcium sulphates
Magnesium sulphates
Calcium bicarbonates
All of the above
Disinfection of water helps in
Removing turbidity
Removing hardness
Killing pathogenic bacteria
Complete sterilisation
The suitable layout for a water supply distribution system, for a city with roads laid in a rectangular pattern, is
Dead end system
Grid system
Ring system
Radial system
Fill in the blanks. 4x2=8
is used· to determine the colour of water.
The most widely used coagulant for water treatment is
Water-tap used in the houses is also known as
The sewer which transports the sewage to the point of treatment is called sewer.
2. Enumerate the guidelines to be followed while collecting a water sample. 7
List the commonly used surface and ground water sources. How will you select a source of water for a water supply scheme? 7
3. Explain, in brief, the water treatment processes followed for pre-treatment. 7
Calculate the diameter and depth of the settling tank to treat a flow of 25,000 m3/d. The maximum SOR is 15 m3/m2_d and the detention period is 3 hours. 7
4. List the various types of layout used in a water distribution system. Explain anyone, with a sketch, in detail. 7
List the joints used for connecting water main or sub-main in water supply pipes. Explain with a neat sketch a flanged joint for connecting water pipes. 7
5. Discuss the various types of manholes and point out their respective advantages. 7
Discuss the impact of inadequate management of waste water and storm water. 7
6. An activated sludge system is to be used for secondary treatment of 10000 m3/d of municipal waste water. After primary clarification, the BOD is 150 mg/l and it is desired to have not more than 5 mg/l of soluble BOD in the effluent. A completely mixed reactor is to be used; and the pilot plant analysis has established the following kinetic values
Y =0·5 kg/kg, kd =0·05 d-1.
Assuming MLSS concentration of 3000 mg/l and an underflow concentration of 10000 mg/l from secondary clarifier, determine
the volume of the reactor, and
the mass and volume of solids that must be wasted each day.
7. Write short notes on any four of the following: 4*3 1/2 =14
Ion-Exchange Method ofWater Softening
Water-borne Diseases
Hydraulic Ram
Break Point Chlorination
Underground Water Sources
Coagulation
DIPLOMA IN CIVIL ENGINEERING DCLE(G) I DCLEVI Tenn-EndExanrlnanon 00343 December, 2016
BCE-033 ENVIRONMENTAL ENGINEERING
Time hours Maximum Marks: 70
Note: Attempt five questions in all. Question no. 1 is compulsory. All questions carry equal marks. Assume any missing data suitably.
1. Choose the ,most appropriate alternative in the following questions: 6xl=6
The average domestic water consumption per capita per day for an Indian city provided with piped water supply and sewage system is taken as
135
210
240
270
Ground water is usually free from
Suspended impurities
Dissolved impurities
Both and
None of these
The usual life of cast iron pipes under normal conditions is about
25 years
50 years
100 years
75 years
Hardness of water is caused due to
Calcium sulphates
Magnesium sulphates
Calcium bicarbonates
All of the above
Disinfection of water helps in
Removing turbidity
Removing hardness
Killing pathogenic bacteria
Complete sterilisation
The suitable layout for a water supply distribution system, for a city with roads laid in a rectangular pattern, is
Dead end system
Grid system
Ring system
Radial system
Fill in the blanks. 4x2=8
is used· to determine the colour of water.
The most widely used coagulant for water treatment is
Water-tap used in the houses is also known as
The sewer which transports the sewage to the point of treatment is called sewer.
2. Enumerate the guidelines to be followed while collecting a water sample. 7
List the commonly used surface and ground water sources. How will you select a source of water for a water supply scheme? 7
3. Explain, in brief, the water treatment processes followed for pre-treatment. 7
Calculate the diameter and depth of the settling tank to treat a flow of 25,000 m3/d. The maximum SOR is 15 m3/m2_d and the detention period is 3 hours. 7
4. List the various types of layout used in a water distribution system. Explain anyone, with a sketch, in detail. 7
List the joints used for connecting water main or sub-main in water supply pipes. Explain with a neat sketch a flanged joint for connecting water pipes. 7
5. Discuss the various types of manholes and point out their respective advantages. 7
Discuss the impact of inadequate management of waste water and storm water. 7
6. An activated sludge system is to be used for secondary treatment of 10000 m3/d of municipal waste water. After primary clarification, the BOD is 150 mg/l and it is desired to have not more than 5 mg/l of soluble BOD in the effluent. A completely mixed reactor is to be used; and the pilot plant analysis has established the following kinetic values
Y =0·5 kg/kg, kd =0·05 d-1.
Assuming MLSS concentration of 3000 mg/l and an underflow concentration of 10000 mg/l from secondary clarifier, determine
the volume of the reactor, and
the mass and volume of solids that must be wasted each day.
7. Write short notes on any four of the following: 4*3 1/2 =14
Ion-Exchange Method ofWater Softening
Water-borne Diseases
Hydraulic Ram
Break Point Chlorination
Underground Water Sources
Coagulation
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