Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 11

The grit and silt of the grit chambers, may not be used for:


Options are :

  • Concreting
  • Both A and B
  • Neither A nor B
  • Raising low lying areas by dumping

Answer :Concreting

The value of Chezy's constant is used in:


Options are :

  • Bazin's formula
  • Manning's formula
  • Kutter's formula
  • Chezy's formula

Answer :Bazin's formula

Pick up the incorrect statement from the following for allowing workers to enter sewers:


Options are :

  • The men entering the manhole should be advised to smoke in the sewer
  • Proper tests for the presence of poisonous gases must be carried out
  • Warning signals should be erected
  • None of these
  • The particular manhole and one manhole on up stream and one manhole on down stream should remain open for 30 minutes

Answer :The men entering the manhole should be advised to smoke in the sewer

Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 2

The most efficient cross section of sewers in a separate sewerage system is:


Options are :

  • Parabolic
  • New egged
  • Circular
  • Rectangular

Answer :Circular

The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning's formula, is given by:


Options are :

  • William-Hazen
  • Bazin
  • Crimp and Bruge
  • Kutter

Answer :Crimp and Bruge

The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be:


Options are :

  • 1.2 m
  • > 1.5 m
  • 1.5 m
  • 0.9 cm

Answer :> 1.5 m

Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 3

The rate of accumulation of sludge per person per year, is:


Options are :

  • 10 litres
  • 30 litres
  • 25 litres
  • 20 litres
  • 15 litres

Answer :20 litres

In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is:


Options are :

  • Combined system
  • None of these
  • Partially combined system
  • Separate system

Answer :Combined system

The formula

used for determining flow velocities in sewers, is known as:


Options are :

  • Bazin's formula
  • Kutter's formula
  • Chezy's formula
  • Manning's formula

Answer :Manning's formula

Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 4

In a sludge tank, the gas mainly produced, is:


Options are :

  • Oxygen
  • Nitrogen
  • Methane
  • Hydrogen
  • Carbon dioxide

Answer :Methane

The disintegrating pump in which solid matter is broken up before passing out, is:


Options are :

  • None of these
  • Centrifugal pump
  • Reciprocating pump
  • Pneumatic ejector

Answer :Centrifugal pump

The most efficient cross-section of sewers in a combined sewerage system is:


Options are :

  • New egged
  • Rectangular
  • Circular
  • Parabolic

Answer :Circular

Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 5

The sewage treatment units in which anaerobic decomposition of organic matter is used, are called:


Options are :

  • Imhoff tanks
  • Trickling filters
  • None of these
  • Sludge sedimentation tanks

Answer :Trickling filters

For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of:


Options are :

  • 120 cm
  • 160 cm
  • 100 cm
  • 140 cm
  • 180 cm

Answer :160 cm

The quantity of liquid waste which flows in sewers during the period of rainfall, is known as:


Options are :

  • Sanitary sewage
  • Storm sewage
  • None of these
  • Industrial waste

Answer :Storm sewage

Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 6

Pick up the incorrect size of stone ware sewers:


Options are :

  • 82.5 cm
  • 67.5 cm
  • None of these
  • 90 cm
  • 52.5 cm

Answer :None of these

In a grit chamber of a sewage treatment plant:


Options are :

  • Flow velocity 0.15 m to 0.3 m/sec is kept
  • All the above
  • One minute of detention period is kept
  • Depth of 0.9 m to 1.20 m is kept

Answer :All the above

The normal values of over flow rates for sedimentation tanks using coagulent, ranges between:


Options are :

  • 80, 000 to 100, 000 litres/sqm/day
  • None of these
  • 50, 000 to 60, 000 litres/sqm/day
  • 25, 000 to 35, 000 litres/sqm/day
  • 40, 000 to 50, 000 litres/sqm/day

Answer :50, 000 to 60, 000 litres/sqm/day

Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 7

1000 kg of sewage contains:


Options are :

  • 0.112 kg in suspension
  • 0.225 kg in solution
  • 0.450 kg in suspension
  • None of these
  • 0.112 kg in solution

Answer :0.112 kg in suspension 0.225 kg in solution

The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock's law, is:


A.


B.


C.


D.


Options are :

  • A
  • C
  • B
  • D

Answer :B

The intensity of rain is expressed in:


Options are :

  • cm/day
  • cm/hour
  • cm/minute
  • None of these

Answer :cm/hour

Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 1

For detecting the nitrates in sewage, the colour may be developed by adding:


Options are :

  • None of these
  • Pottassium permanganate
  • Phenol-di-sulphuric acid and pottassium hydroxide
  • Sulphuric acid and napthamine

Answer :Phenol-di-sulphuric acid and pottassium hydroxide

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