Waste Water Engineering Questions

• At the junction of sewers
• The pH value of fresh sewage is usually
• Depletion of ozone layer in the outer atmosphere may cause
• The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is
• Sluge banks are formed if sewage is disposed of in
• Lead acetate test in sewer manhole is done to test the presence of
• Dried sewage after treatment is used as
• The maximum diameter of sewers adopted in the designs is
• Lead caulked joints are used for laying
• The design period of sewage treatment works in normally
• Pick up the correct statement from the following :
• For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed
• If D is the diameter of upper circular portion, the area of cross-section of a standard egg shaped sewer, is
• The sewer which received discharge from two or more main sewers, is known as
• The stone ware sewers
• If D is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is
• If the grit in grit chambers is 4.5 million litres per day, its cleaning is done
• The ratio of depths at partial flow with central angle α and at full flow of a sewer, is
• In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time
• Pick up the correct statement from the following :