ENVIRONMENTAL ENGINEERING (BCE-033): Diploma Civil Engineering, term end examination December 2012 Question Paper

Looking for IGNOU question papers? Here is a question, ENVIRONMENTAL ENGINEERING  (BCE-033) for Diploma Civil Engineering. This is Term-End Examination conducted in the year December, 2012. Read on to get it from here and use it for your future exams.

Diploma in Civil Engineering (DCLE(G)) DCLEVI 

Term-End Examination 

December, 2012 

BCE-033 : ENVIRONMENTAL ENGINEERING 

Time : 2 hours Maximum Marks : 70

Note : Attempt five questions in all. Q. no. 1 is compulsory. 

All questions carry equal marks. 

1. (a) Design period of water distribution system is normally kept as : 14x1=14 

(i) 100 years (ii) 20 years  (iii) 30 years (iv) 50 years 

(b) If W is the density of water, Q is the discharge in cubic meter per second and H is total Head, the required horse power as the pump is : 

 (i) WQH/75    (ii) WQH /360 (iii) WQH/225 (iv) WQH/550

(c) Disinfectioning of drinking water is done to remove : 

(i) Turbidity (ii) Odour (iii) Colour (iv) Bacteria   (v) all of the above. 

(d) Biochemical Oxygen Demand (B.O.D) of safe drinking water must be : 

(i) zero (ii) 5 (iii) 15 (iv) 20 

(e) The most commonly used coagulant is : 

(i) Chlorine (ii) Alum (iii) Lime (iv) Bleaching powder 

(f) An aquifer, sandwiched between the top and the bottom aquicludes, will supply water to a well is called : 

(i) Non-Artesian well (ii) Artesian well  (iii) Flowing well (iv) None of these 

(g) The slow sand filters remove bacteria to the extent of : 

(i) 80-90%  (ii) 90-95%  (iii) 98-99% (iv) None of these 

(h) The greywater does not consist of waste water from : 

(i) bath rooms

(ii) wash basins 

(iii) kitchens

(iv) toilets 

(i) A Drop Manhole is provided if : 

(i) A sewer drops from a height 

(ii) a branch sewer joins the main sewer at higher level 

(iii) A lamp is inserted to check obstruction 

(iv) None of above. 

(j) The gas coming out from a sludge digestion tank is : 

(i) Methane only 

(ii) Carbon dioxide only 

(iii) 70% methane and 30% carbon dioxide 

(iv) 30% methane and 70% carbon dioxide 

(k) The value of coefficient of runoff for perfectly impervious areas, tend to : 

(i) zero (ii) 0.5 (iii) 1.0 (iv) Infinity 

(l) For BOD and COD which statement is correct ? 

(i) BOD<COD  (ii) BOD=COD  (iii) BOD>COD (iv) None of these 

(m) The maximum efficiency of BOD removed is achieved in : 

(i) oxidation ditch (ii) oxidation pond   (iii) aerated lagoon (iv) trickling filter 

(n) Sludges are stabilized to : 

(i) reduce their pathogens 

(ii) eliminate offensive odour 

(iii) reduce the potential for purification 

(iv) all of above 

(v) none of above

2. (a) How wells are classified. ? Distinguish  between gravity and artesian wells.  (3+4)

(b) What is the significance of Most Probable Number (MPN) test in water quality determination and how it is measured?  (7)

3. (a) Discuss the guidelines to be followed while collecting water samples. (7)

(b) List the water treatment processes covered under "pre-treatment processes". Discuss any one of the processes. (3+4)

4. With the help of neat sketch describe the functioning of slow sand filter.  (14)

5. (a) With the help of line diagram describe the working of Hydraulic Ram. (6)

(b) Differentiate between centrifugal and reciprocating pumps with reference to following :  (4 x 2 = 8)

(i) Discharge of flow 

(ii) Speed of pump 

(iii) Efficiency 

(iv) Floor space requirement

6. (a) With the help of neat sketch discuss the working of junction chamber.  (7)

(b) What is crown corrossion and how it can be prevented ?  (7)

7. Write short notes on any four of the following : 

(a) Infilteration galleries 

(b) Screens 

(c) Break point chlorination 

(d) Flanged joint 

(e) Sewer rehabilitation 

(f) Factors affecting water demand

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