## 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

##### The value of Chezy's constant is used in:Larger image

Options are :

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

Options are :

• Parabolic
• New egged
• Circular
• Rectangular

##### 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

Options are :

• 1.2 m
• > 1.5 m
• 1.5 m
• 0.9 cm

Options are :

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

##### The formula Larger image used for determining flow velocities in sewers, is known as:

Options are :

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

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

Options are :

• Oxygen
• Nitrogen
• Methane
• Hydrogen
• Carbon dioxide

##### 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

Options are :

• New egged
• Rectangular
• Circular
• Parabolic

##### 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

Options are :

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

##### 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

##### 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

##### 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

##### 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

Options are :

• A
• C
• B
• D

##### The intensity of rain is expressed in:

Options are :

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

##### 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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