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This set of Water and Wastewater Engineering Multiple Choice Questions & Answers (MCQs) focuses on Water And Wastewater Engineering Set 8
Q1 | For determining the velocity of flow of underground water, the most commonly usednonempirical formula is
- Darcy's formula
- Slichter's formula
- Hazen's formula
- Lacy's formula
Q2 | The most commonly used chemical for de-chlorination of water, is
- Sodium thiosulphate
- Sodium bisulphate
- Sodium sulphite
- Sulphur-dioxide
Q3 | To remove very fine suspended particles from water, the method adopted is
- Screening
- Sedimentation
- Boiling
- Filtration
Q4 | Sunlight
- Helps growth of bacterias
- Impedes growth of algae
- Increases dissolved oxygen content
- Reduces turbidity
Q5 | The detention period for plain sedimentation water tanks, is usually
- 4 to 8 hours
- 8 to 16 hours
- 16 to 24 hours
- 24 to 36 hours
Q6 | Air valves are generally provided in pressure pipes of water supply
- At pipe junctions (B) (C) (D)
- At summits
- At low points
- Near service pipes
Q7 | The gaseous form of chlorine gets converted into liquid form when subjected to a pressure of
- 5 kg/cm2
- 6 kg/cm2
- 7 kg/cm2
- 10 kg/cm2
Q8 | Flow through period, in sedimentation tanks, is
- Equal to detention period
- More than detention period
- Less than detention period
- Detention period divided by displacement efficiency
Q9 | The maximum hourly consumption, is generally taken as
- 110%
- 120%
- 140%
- 150%
Q10 | Hardness of water can be removed by boiling if it is due to
- Calcium bicarbonates
- Calcium sulphates
- Calcium chloride
- Calcium nitrates
Q11 | Hardness of water is caused by
- Presence of soap lather
- Presence of chlorides and sulphates of sodium and potassium
- Presence of bicarbonates, sulphates or chlorides of calcium and magnesium
- Turbidity
Q12 | The average domestic consumption under normal conditions in an Indian city per day perperson, is
- 105 litres
- 115 litres
- 125 litres
- 135 litres
Q13 | If d is the diameter of the pipe, p is the total internal pressure, f is the permissible tensile stressand n is the effective of the joint, the thickness t of metal pipe, is
- n (pd/2f)
- (1/n) (pd/2f)
- (1/n) (pd/3f)
- (1/n) (pf/d)
Q14 | Generally, first portion of a logistic curve for the population growth of a developing city,represents the growth of
- Increasing
- Decreasing
- Constant
- All the above
Q15 | A pressure conduit carrying water beneath a stream or a canal, is known as
- Sag (B) (C) (D)
- Depressed pipe
- Inverted syphon
- All the above
Q16 | Most satisfactory formula for an estimate of fire demand Q for a city of population P inthousands for Indian conditions, is
- Q = 1115 (p/5 + 20)
- Q = 1640 ?? (1 - 0.01 ??)
- Q = 3180 ??
- None of these
Q17 | Permanent hardness of water can be removed by
- Adding alum
- Adding lime
- Adding chlorine
- Zeolite process
Q18 | The maximum depth of sedimentation tanks is limited to
- 2 m (B) (C) (D)
- 3 m
- 5 m
- 6 m
Q19 | Pick up the incorrect statement from the following. Intake of water supply should
- Be nearer to the treatment plant
- Receive water from purer zone of the source
- Be located downstream of waste water disposal point
- Remain easily accessible during floods
Q20 | The fire demand of a city may be worked out by
- Kuichling's formula
- Freeman formula
- Under Writers formula
- All the above
Q21 | The formula HL = n²V²L/R4/3 for the head loss in conduits is generally known as
- Hazen-William's formula
- Manning's formula
- Darcy-Weisbach formula
- Nikuradse formula
Q22 | The joint used for joining the plain ends of cast iron pipes, is
- Flanged joint
- Socket and spigot joint
- Dresser coupling joint
- Flexible joint
Q23 | Disinfection of water with ozone is not good because
- It vanishes before water reaches the consumers
- It removes the colour, taste and odour from water as bacterias
- It adds taste to the water
- It is more efficient than chlorine in killing bacterias
Q24 | The prescribed hardness limit of potable water ranges between
- 50 to 75 P.P.M.
- 75 to 115 P.P.M.
- 100 to 150 P.P.M.
- 150 to 200 P.P.M.
Q25 | While designing a water supply of an industrial township, industrial and commercial waterdemand of total supply, is assumed
- 10 % (B) (C) (D)
- 10 to 15 %
- 15 to 20 %
- 20 to 25 %