Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) (CE)- Civil Engineering 2020 December 6th Sem 71087 Environmental Engineering Ii Previous Question Paper
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (CE) (2012 to 2017) (Sem.?6)
ENVIRONMENT AL ENGINEERING-II
Subject Code : BTCE-606
M.Code : 71087
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Answer briefly :
1.
What is meant by Dry Weather Flow (DWF)? How is it important in sewer design?
2.
What is `Time of Concentration'? How does it affect the design of storm sewers?
3.
What is a Grit Chamber?
4.
Define Sewage and Sullage.
5.
Discuss the main function of Activated sludge process.
6.
What is meant by self-cleansing velocity in sewers? How is it important?
7.
Differentiate between separate sewer and combined sewer.
8.
State the advantages of VASB reactors.
9.
What is meant by high rate trickling filter?
10. What is meant by relative stability?
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SECTION-B
11. Differentiate between Septic tank and Imhoff tank.
12
If the 3-day 25?C BOD of sample of sewage is 225 mg/l, what will be its 5-day 30?C
BOD? K20 = 0.1d-1, temperature coefficient = 1.047.
13. Sketch and explain the construction and working of inverted siphons.
14. Define BOD. Derive expression for first stage BOD.
15. Distinguish between an oxidation ditch and oxidation pond.
SECTION-C
16. A grit chamber is designed to remove particles with a diameter of 0.2 mm, specific
gravity is 2.65, settling velocity for these particles has been found to range from 0.016 to
0.022 m/sec, depending on their shape factor. A flow through velocity of 0.3 m/sec will
be maintained by proportioning weir. Determine the channel dimensions for a maximum
waste water flow of 10,000 cum/day.
17. Enumerate the various methods that can be used to dispose of the digested sludge.
Discuss in details the working, of any of these two important methods, which are useful
in Indian conditions.
18. Write short notes on the following :
a) One pipe system and single stack system of plumbing.
b) Grease trap and skimming tank.
c) Septic Tank and Imhoff tank.
d) LRTF and HRTF.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 13 February 2021