Dr. Mahalingam College of Engineering & Technology, Pollachi – 642 003 (An Autonomous Institution affiliated to Anna University) Department of Civil Engineering 16CET55 - ENVIRONMENTAL ENGINEERING II QUESTION BANK AY 2018 – 2019 BATCH 2016 V TH SEMESTER 16CET55 - ENVIRONMENTAL ENGINEERING II Page 1 UNIT-1 PLANNING FOR SEWERAGE SYSTEMS 1) The liquid waste originating from residential and industrial buildings are collectively called a. domestic sewage b. combined sewage c. sanitary sewage d. none of these 2) The sewer which transports the sewage to the point of treatment is called a. house sewer b. main sewer c. outfall sewer d. none of these 3) A combined sewerage system , collectively carries a. domestic and industrial sewage b. storm and domestic sewage c. storm and industrial sewage d. storm and sanitary sewage 4) The sewerage system originates from a. outfall sewer b. main sewer c. house sewer d. none of these 5) A sewer which receives the discharge from a number of independent houses , is called a. house sewer b. intercepting sewer c. lateral sewer d. none of these 6) A sewer pipe carrying sewage from a building to the point of its immediate disposal is called a. intercepting sewer b. lateral sewer c. house sewer d. none of these
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Dr. Mahalingam College of Engineering & Technology, Pollachi – 642 003 (An Autonomous Institution affiliated to Anna University)
Department of Civil Engineering 16CET55 - ENVIRONMENTAL ENGINEERING II
QUESTION BANK AY 2018 – 2019 BATCH 2016 VTH SEMESTER
16CET55 - ENVIRONMENTAL ENGINEERING II Page 1
UNIT-1
PLANNING FOR SEWERAGE SYSTEMS
1) The liquid waste originating from residential and industrial buildings are collectively called
a. domestic sewage
b. combined sewage
c. sanitary sewage
d. none of these
2) The sewer which transports the sewage to the point of treatment is called
a. house sewer
b. main sewer
c. outfall sewer
d. none of these
3) A combined sewerage system , collectively carries
a. domestic and industrial sewage
b. storm and domestic sewage
c. storm and industrial sewage
d. storm and sanitary sewage
4) The sewerage system originates from
a. outfall sewer
b. main sewer
c. house sewer
d. none of these
5) A sewer which receives the discharge from a number of independent houses , is called
a. house sewer
b. intercepting sewer
c. lateral sewer
d. none of these
6) A sewer pipe carrying sewage from a building to the point of its immediate disposal is called
a. intercepting sewer
b. lateral sewer
c. house sewer
d. none of these
Dr. Mahalingam College of Engineering & Technology, Pollachi – 642 003 (An Autonomous Institution affiliated to Anna University)
Department of Civil Engineering 16CET55 - ENVIRONMENTAL ENGINEERING II
QUESTION BANK AY 2018 – 2019 BATCH 2016 VTH SEMESTER
16CET55 - ENVIRONMENTAL ENGINEERING II Page 2
7) When rainy season is confined to a few months, like that in India, the preferred sewerage system
would be
a. combined system
b. separate system
c. partially separate system
d. none of these
8) The suitable system of sanitation for an area having uniformly distributed mild rains through the
year like that in England is
a. Combined system
b. Separate system
c. Partially combined system
d. Partially separate system
9) The water carriage system of collection of waste products is preferred to dry conservancy system,
because
a. Cheap initial cost
b. No treatment required before disposal
c. More hygienic in nature
d. Easier to maintain
10) The water coming from kitchens and bath rooms is popularly known as
a. Domestic sewage discharge
b. Sludge discharge
c. Drainage discharge
d. None of these
11) In a city drainage system, having drainage to sewage ratio as 20 , the peak dry weather flow
would amount to
a. 20% of the design discharge
b. 5% of the design discharge
c. slightly less than 5% of the design discharge
d. slightly more than 5% of the design discharge
12) For the design of sewrs in India, the percentage of sewage discharge, is assumed as
a. 25 - 30% of water supplied from water works
Dr. Mahalingam College of Engineering & Technology, Pollachi – 642 003 (An Autonomous Institution affiliated to Anna University)
Department of Civil Engineering 16CET55 - ENVIRONMENTAL ENGINEERING II
QUESTION BANK AY 2018 – 2019 BATCH 2016 VTH SEMESTER
16CET55 - ENVIRONMENTAL ENGINEERING II Page 3
b. 75 - 80% of water supplied from water works
c. 100% of water supplied from water works
d. none of these
13) The sewer pipes have to be designed and checked for
a. only maximum flow
b. only minimum flow
c. both maximum and minimum flows
d. none of them
14) Sewage treatment works are normally designed for a design period of
a. 40 - 50 years
b. 30 - 40 years
c. 15 - 20 years
d. 5 - 10 years
15) Sewage pumping plants are normally designed for a design period of
a. 40 - 50 years
b. 30 - 40 years
c. 15 - 20 years
d. 5 - 10 years
16) For indian cities , like Delhi or Calcutta, the per capita sewage production may be of the order of
a. 500 litres
b. 200 litres
c. 100 litres
d. None of these
17) The peak design flows, expressed as number of times their average values, will be
a. greater for smaller lateral sewers
b. greater for larger trunk sewers
c. equal for all sizes and types of sewers
d. none of the above
18) The ratio of maximum daily sewage flow to the average daily sewage flow for sewer mains of 0.5
to 1 m diameter, is generally taken as
a. 1.5
b. 2
Dr. Mahalingam College of Engineering & Technology, Pollachi – 642 003 (An Autonomous Institution affiliated to Anna University)
Department of Civil Engineering 16CET55 - ENVIRONMENTAL ENGINEERING II
QUESTION BANK AY 2018 – 2019 BATCH 2016 VTH SEMESTER
16CET55 - ENVIRONMENTAL ENGINEERING II Page 4
c. 3
d. None of these
19) The ratio of maximum daily sewage flow to the average daily sewage flow for trunk sewers, above
1.25 m diameter, is generally taken as
a. 1.5
b. 2
c. 3
d. 4
20) The ratio of maximum daily sewage flow to the average daily sewage flow for small sewers and
laterals up to 0.25 m diameter, is generally taken as
a. 1.5
b. 2
c. 3
d. 4
21) The ratio of maximum daily sewage flow to the average daily sewage flow for branch sewers up
to 0.5 m diameter, is generally taken as
a. 1.5
b. 2
c. 3
d. 4
22) The ratio of minimum hourly flow to the average flow of sewage is
a. 1/3
b. ½
c. 2/3
d. 3
23) For moderate sized areas and sewers say upto 1 m in diameter , the maximum hourly drafts may
be considered as equal to
a. 1.5 times the maximum daily
b. 3 times the maximum daily
c. 1/3 times the maximum daily
d. none of the above
Dr. Mahalingam College of Engineering & Technology, Pollachi – 642 003 (An Autonomous Institution affiliated to Anna University)
Department of Civil Engineering 16CET55 - ENVIRONMENTAL ENGINEERING II
QUESTION BANK AY 2018 – 2019 BATCH 2016 VTH SEMESTER
16CET55 - ENVIRONMENTAL ENGINEERING II Page 5
24) The peak flow for the design of sewers , has been conected to the average flow and the
population of the city in thousands , by an empricial relation, given by
a. Q = [(18+(SQR(P)))/(4+(SQR(P)))]*Qav
b. Q = [(4+(SQR(P)))/(18+(SQR(P)))]*Qav
c. Q = [(18+P)/(4+(SQR(P)))]*Qav
d. none of these
25) Point out the wrong statement , in the following assumptions, generally made in the design of
moderate sized sewers
a. average daily flow = annual average daily flow
b. maximum daily flow = 2 average daily flow
c. maximum hourly flow = 3 average daily flow
d. none of them
26) The minimum and the maximum diameter of sewers, generally adopted in the designs, may be
a. 15 cm and 100 cm
b. 15 cm and 300 cm
c. 25 cm and 450 cm
d. 60 cm and 300 cm
27) The rational formula for evaluating peak drainage discharge , can be safely applied to catchments
up to
a. 25 Hectares
b. 500 Hectares
c. 2000 Hectares
d. up to any limit
28) The value of the coefficient of runoff for paved areas is of the order of
a. 0
b. 0.5
c. 0.9
d. >1
29) The value of the coefficient of runoff for perfectly impervious areas is of the order of
a. 0
b. 0.5
c. 1
Dr. Mahalingam College of Engineering & Technology, Pollachi – 642 003 (An Autonomous Institution affiliated to Anna University)
Department of Civil Engineering 16CET55 - ENVIRONMENTAL ENGINEERING II
QUESTION BANK AY 2018 – 2019 BATCH 2016 VTH SEMESTER
16CET55 - ENVIRONMENTAL ENGINEERING II Page 6
d. Infinity
30) Critical rainnfall intensity woyld always be ____________ the hourly rainfall value, if Tc excedd 1
hour
a. more than
b. less than
c. equal to
d. slightly more than
31) The rational formula for peak drainage discharge computations was evolved by
a. Kuichling
b. Fruhling
c. Lloyd David
d. All of them
32) If the overland from the critical point to the mouth of a drain is 12 km and the difference in levels
between theses points is 14.5 m , then the inlet time would be of the order of
a. 2 hours
b. 4 hours
c. 6 hours
d. 8 hours
33) The drainage discharge of a town of 16 hectares area, consisting of 40% hard paved (k = 0.8),
30% unpaved(k= 0.2), and remaining as wooded (k= 0.1) , with a mx rain intensity of 5 cm/hr,
would be computed by rational formula as equal to
a. 0.91 cumecs
b. 0.091 cumecs
c. 9.1 cumecs
d. none of these
34) The appropriate percentage of water in sewage is
a. 90%
b. 99%
c. 99.9%
d. 99.99%
35) The specific gravity of sewage is
a. 0
Dr. Mahalingam College of Engineering & Technology, Pollachi – 642 003 (An Autonomous Institution affiliated to Anna University)
Department of Civil Engineering 16CET55 - ENVIRONMENTAL ENGINEERING II
QUESTION BANK AY 2018 – 2019 BATCH 2016 VTH SEMESTER
16CET55 - ENVIRONMENTAL ENGINEERING II Page 7
b. Slighlt less than 1
c. Equal to 1
d. Slightly greater than 1
36) Pick up the incorrect statement
a. Aerobic bacteria flourish in the presence of oxygen
b. Anaerobic bacteria flourish in the absence of oxygen
c. Facultative bacteria flourish in the presence as well as absence of oxygen
d. None of the above
37) Well oxidized sewage will contain nitrogen, largely in the form of
a. Nitrites
b. Nitrates
c. Free ammonia
d. All of these
38) Partially oxidized stale sewage will contain nitrogen mainly in the form of
a. Nitrites
b. Nitrates
c. Free ammonia
d. A and c
39) Well oxidized sewage will contain sulphur largely in the form of
a. Sulphites
b. Sulphates
c. Hydrogen sulphide
d. All of these
40) Gases , which are generally evolved during aerobic decomposition of sewage are
a. CO2+NH3+H2S
b. CO2+NH3+H2S+ CH4
c. CO2+NH3 + SO2
d. CO2+NH3 + SO2+ CH4
41) Gases , which are generally evolved during anaerobic decomposition of sewage are
a. CO2+NH3+H2S
b. CO2+NH3+H2S+ CH4
c. CO2+NH3 + SO2
Dr. Mahalingam College of Engineering & Technology, Pollachi – 642 003 (An Autonomous Institution affiliated to Anna University)
Department of Civil Engineering 16CET55 - ENVIRONMENTAL ENGINEERING II
QUESTION BANK AY 2018 – 2019 BATCH 2016 VTH SEMESTER
16CET55 - ENVIRONMENTAL ENGINEERING II Page 8
d. CO2+NH3 + SO2+ CH4
42) Temperature variations affect the
a. Biological activity of bacteria in sewage
b. Viscosity of sewage
c. Solubility of gases in sewage
d. All the above
43) 1000kg of sewage is estimated to contain, approximately, total solids, equal to
a. 0.5 – 1 kg
b. 2 – 5 kg
c. 5 – 10 kg
d. 10 – 20 kg
44) Imhoff cone is used to measure in sewage
a. Total soilds
b. Total organic solids
c. Total inorganic solids
d. Settelable solids
45) The pH of fresh sewage is usually
a. <7
b. >7
c. = 7
d. = 0
46) Acidity of sewage is indicated by a pH value of
a. <7
b. >7
c. = 7
d. = 14
47) pH = 3 when compared to pH = 5 will be more acidic by
a. 2 times
b. 20 times
c. 100 times
d. None of them
48) pH = 4 when compared to pH = 7 will be more acidic by
Dr. Mahalingam College of Engineering & Technology, Pollachi – 642 003 (An Autonomous Institution affiliated to Anna University)
Department of Civil Engineering 16CET55 - ENVIRONMENTAL ENGINEERING II
QUESTION BANK AY 2018 – 2019 BATCH 2016 VTH SEMESTER
16CET55 - ENVIRONMENTAL ENGINEERING II Page 9
a. 3 times
b. 300 times
c. 1000 times
d. None of them
PART-B
1. Define Population Equivalent
2. Define (a) SULLAGE (b)MINAS
3. Define Sewerage
4. List the two types of Sewage System
5. List the components of sewerage system
6. Define peak drainage discharge
7. Mention the impacts of nutrients on water bodies
8. State the effect of oxygen demanding waste on water bodies
9. Mention the effect of oxygen demanding waste on water bodies
10. Enumerate the sources of waste water
11. State the reason why analyses BOD and COD usually give different results for the same waste
water
12. Define suspended solids and state the effect of suspended solids on water bodies
13. Name sewage characteristics with which organic matter concentration is
expressed
14. Distinguish between “dry weather flow” and “wet weather flow”
15. Explain the meaning and significance of time of concentration
16. Distinguish between “self-cleansing velocity” and “Non scouring velocity”
17. Define BOD (Biochemical oxygen demand), COD (Chemical oxygen demand)?
18. Define critical rainfall duration
19. Define intensity of rainfall
20. State the necessity of waste water characterization
21. State the effluent standards for any four parameters recommended by the pollution control board
22. State the five parameters of effluent standards for sewage disposal into inland surface water
bodies
23. Brief the characteristics of sewage from south Indian cities
24. State the necessity of legal requirements for effluent disposal of sewage