Water And Wastewater Engineering Set 7

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This set of Water and Wastewater Engineering Multiple Choice Questions & Answers (MCQs) focuses on Water And Wastewater Engineering Set 7

Q1 | Gravity conduits are generally in the form of
  • Canals
  • Flumes
  • Aqueduct
  • All the above
Q2 | The bed slope in slow sand filters, is generally kept
  • 1 in 50
  • 1 in 75
  • 1 in 100
  • 0.180555556
Q3 | Perched aquifers are generally found
  • On the surface of the ground
  • Below the surface of the ground but above water table
  • Below the water table
  • All the above
Q4 | Pick up the incorrect statement from the following:
  • The pH value of water indicates the logarithm of reciprocal of hydrogen ion concentration in water
  • Higher value of pH means lower hydrogen ion concentration
  • Lower value of pH means higher hydrogen ion contraction
  • Lower value of pH gives alkaline solution
Q5 | Mostly used coagulant, is
  • Chlorine
  • Alum
  • Lime
  • Bleaching powder
Q6 | A centrifugal pump is required to be primed before starting if it is located
  • At higher level than water level of reservoir
  • At lower level than water level of reservoir
  • Both (a) and (b)
  • Neither (a) nor (b)
Q7 | Normal values of overflow rate for plain sedimentation tank, is
  • 250 to 500 litres/hr/m2
  • 500 to 750 litres/hr/m2
  • 750 to 1000 litres/hr/m2
  • 1000 to 1250 litres/hr/m2
Q8 | 'Shrouding' is essentially provided in
  • Strainer type wells
  • Cavity type wells
  • Slotted type well
  • All the above
Q9 | The maximum permissible hardness for public supplies is
  • 95 mg/litre
  • 105 mg/litre
  • 115 mg/litre
  • 125 mg/litre
Q10 | The chlorine supply cylinders are generally kept at 38°C to 40°C to prevent
  • Conversion into crystals
  • It from burning
  • It from explosion
  • None of these
Q11 | For calculation of economical diameter D of a pipe in metres for a discharge Q to be pumped incumecs, Lea suggested the empirical formula
  • D = 0.22 ??
  • D = 1.22 ??
  • D = 2.22 ??
  • D = 3.22 ??
Q12 | An earth formation which, although porous and capable of absorbing water does not provide anappreciable supply to wells, is known as
  • Aquifer
  • Aquiclude
  • Aquifuge
  • None of these
Q13 | Property of earth to allow water to pass through it, is known as
  • Perviousness
  • Porosity
  • Permeability
  • Tr
Q14 | If G is the specific gravity of particles of diameter d, the velocity of settlement V in still water atT°C, according to Stoke's law, is
  • V = 418 (G - 1) d² [(3T + 70)/100]
  • V = 418 (G - 1) d [(3T - 70)/100]
  • V = 418 (G - 1) d² [(2T + 70)/100]
  • V = 418 (G - 1) d 4 [(3T + 70)/100]
Q15 | Distribution mains of any water supply, is normally designed for its average daily requirement
  • 100%
  • 150%
  • 200%
  • 225%
Q16 | Maximum threshold number permitted for indicating the odour of public water supplies, is
  • 1
  • 2
  • 3
  • 4
Q17 | The rate of silting in a reservoir
  • Is less in the beginning
  • Remains constant throughout
  • Is more in the beginning
  • is more in the beginning and reduces in the end
Q18 | Corrosion of well pipes may not be reduced by
  • Reducing the draw down and the pumping rate
  • Reducing the flow velocity
  • Using thicker pipes
  • Using screens having larger area of openings
Q19 | Recuperation test is carried out to determine
  • Turbidity of water
  • pH value of water
  • Yield of well
  • Discharge from a well
Q20 | Pick up the incorrect statement from the following. The underground sources of water, is from
  • Wells
  • Springs
  • Infiltration wells
  • Storage reservoirs
Q21 | Most important method for calculating discharge for planning a water supply project, is
  • Velocity area method
  • Weir or spillway method
  • Use of venturi-meter
  • Using power plant consumption
Q22 | In a rapid sand filter, air binding is caused due to excessive
  • Negative pressure
  • Pressure
  • Turbidity
  • Water pressure
Q23 | One degree of hardness of water means a content of salts of
  • 10.25 mg/litre
  • 12.25 mg/litre
  • 14.25 mg/litre
  • 16.25 mg/litre
Q24 | The U.C. (uniformity coefficient) D60/D10 for the best filter media sand should be
  • 2
  • 3
  • 4
  • 5
Q25 | Manholes are less common in
  • Cast iron pipes
  • Steel pipes
  • Hume steel pipes
  • R.C.C. pipes