Waste Water Engineering

A. 1.5
B. 2.0
C. 3.0
D. 4.0

A. Flow velocity 0.15 m to 0.3 m/sec is kept
B. Depth of 0.9 m to 1.20 m is kept
C. One minute of detention period is kept
D. All the above

A. Small sewers are cleaned by flushing
B. Medium sewers are cleaned by cane rodding
C. Medium sewers may be cleaned by pills
D. All the above

A. Methane gas
B. Hydrogen sulphide
C. Carbondioxide gas
D. Diesel vapours

A. City
B. Out-fall
C. Tail end
D. Any point

A. Maximum daily flow = 2 times the average daily flow
B. Maximum daily flow = average daily flow
C. Sewers are designed for minimum permissible velocity at minimum flow
D. All the above

A. Centrifugal pump
B. Reciprocating pump
C. Pneumatic ejector
D. Air pressure pump

A. 2.5 to 3.0 m/sec
B. 3.0 to 4.0 m/sec
C. 3.5 to 4.5 m/sec
D. 4.5 to 5.5 m/sec

A. Large suspended organic solids
B. Oil and grease
C. Sand and girt
D. Floating materials

A. 1 in 5
B. 1 in 10
C. 1 in 15
D. 1 in 20