The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is____________________?
(A) 1.5
(B) 2.0
(C) 3.0
(D) 4.0
For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is____________________?
(A) Cast iron sewers
(B) Cement concrete sewers
(C) Glazed bricks sewers
(D) Stone ware sewers
The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is __________________?
(A) 5 m
(B) 5.5 m
(C) 6.5 m
(D) 7 m
The normal values of over flow rates for secondary sedimentation tanks, ranges between__________________?
(A) 25,000 to 35,000 litres/sqm/day
(B) 40,000 to 50,000 litres/sqm/day
(C) 50,000 to 60,000 litres/sqm/day
(D) 80,000 to 10,000 litres/sqm/day
If the pH value of sewage is 7__________________?
(A) It is acidic
(B) It is alkaline
(C) It is neutral
(D) None of these
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed________________?
(A) 1.5
(B) 2.0
(C) 2.5
(D) 3.0
For design purposes, the normal rate of infiltration of ground water into the sewer, is___________________?
(A) 500 litres/km/cm
(B) 1000 litres/km/cm
(C) 1500 litres/km/cm
(D) 2000 litres/km/cm
The drop man holes are generally provided in sewers for____________________?
(A) Industrial areas
(B) Large town ships
(C) Hilly town ships
(D) Cities in plains
A rain sanitary sewer is constructed to carry_________________ ?
(A) Sanitary sewage
(B) Storm sewage
(C) Surface water
(D) Ground water
For house drainage minimum gradient is__________________?
(A) 1 in 60
(B) 1 in 80
(C) 1 in 10
(D) 1 in 400