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This set of Water and Wastewater Engineering Multiple Choice Questions & Answers (MCQs) focuses on Water And Wastewater Engineering Set 6
Q1 | The asbestos cement pipes are generally laid
- Horizontally
- Vertically
- At an angle of 30°
- At an angle of 60°
Q2 | The design period in years for pumping plants, is
- ) 1
- 2 to 3
- 3 to 5
- 5 to 10
Q3 | Design period of 40 to 50 years is adopted for
- Branch sewers
- Main sewers
- Trunk sewers
- All the above
Q4 | In very first stage of decomposition of the organic matter in sewage
- Nitrites are formed
- Nitrates are formed
- Carbondioxide is formed
- Ammonia is formed
Q5 | In a city the ratio of the drainage to sewage is 20, the percentage discharge passing throughnonmonsoon periods, is
- 5
- 10
- 15
- 20
Q6 | The self-cleansing velocity of water flowing through pipe lines, is
- 2 metres/sec
- 1 metre/sec
- 0.5 metre/sec
- 0.25 metre/sec
Q7 | In case of sewer lines
- Water test is carried out to check water tightness of the joints
- Test for straightness is carried out with the help of a lamp and mirror
- Obstruction test is carried out with the help of smooth ball of diameter 13 mm
- All the above
Q8 | The normal values of over flow rates for secondary sedimentation tanks, ranges between
- 25,000 to 35,000 litres/sqm/day
- 40,000 to 50,000 litres/sqm/day
- 50,000 to 60,000 litres/sqm/day
- 80,000 to 10,000 litres/sqm/day
Q9 | A manhole is classified as shallow if its depth is between
- 0.4 to 0.5 m
- 0.5 to 0.7 m
- 0.7 to 0.9 m
- 0.9 to 1.20 m
Q10 | The first stage of neutral process of sludge digestion, is
- Acid fermentation
- Acid regression
- Alkaline fermentation
- None of these
Q11 | The formula V = (1/n) r2/3 ?? used for determining flow velocities in sewers is known as,
- Chezy's formula
- Bazin's formula
- Kutter's formula
- Manning's formula
Q12 | In sewers the highest non-scouring velocity is achieved in
- Glazed bricks sewers
- Cast iron sewers
- Cement concrete sewers
- Stone ware sewers
Q13 | When the reduced level of the water source is higher than the reduced level of the consumer'splace, water is generally supplied
- By pumping system
- By gravitational system
- Both (a) and (b)
- All the above
Q14 | Surcharge storage zone of a reservoir, is
- Below dead storage (B) (C) (D)
- Between dead storage and useful storage
- Above useful storage
- Also known as valley storage
Q15 | In pressure supply mains, water hammer pressure is reduced by providing
- Sluice valves
- Air valves
- Pressure relief valves
- None of these
Q16 | Specific capacity or yield of wells, is generally expressed, as
- m 3 per sec
- m 3 /hour
- m 3 /hour/m2
- m 3 /hour/m2 /m
Q17 | Turbidity of raw water is a measure of
- Suspended solids
- Acidity of water
- B.O.D.
- None of these
Q18 | If the chosen diameter of a pipe, is less than the economical diameter
- Cost of pipe will be less
- Head loss will be high
- Cost of pumping will be more than saving
- All the above
Q19 | While determining the yield of open wells by the pumping test
- Velocity of recharging water, increases with depression head
- Depression head resulting at critical velocity, is called critical depression head
- Working head is generally limited to 1/3 rd of the critical depression head
- Maximum safe yield of an open well, is expected at critical depression head
Q20 | The process of passing water through beds of granular materials, is called
- Screening
- Sedimentation
- Filtration
- None of these
Q21 | For the prediction of future population of a city, the factor to be considered, is
- Births
- Deaths
- Migrants
- All the above
Q22 | Mathamoglobinemia or blue baby disease is caused due to
- Chlorides
- Nitrites
- Nitrates
- Sulphides
Q23 | To control the growth of algae in reservoirs, the compound which is used, is
- Bleaching powder
- Copper sulphate
- Lime solution
- Alum solution
Q24 | A pressure conduit laid underground, may not be subjected to
- Internal pressure of water
- Pressure due to external load
- Longitudinal temperature stress
- Longitudinal stresses due to unbalanced pressure to bends
Q25 | The bacterias which require free oxygen for their survival, are called
- Aerobic bacterias
- Anaerobic bacterias
- Facultative bacteria
- None of these