If represent the total horizontal stress, total vertical stress, effective horizontal stress and effective vertical stress on a soil element, respectively, the coefficient of earth pressure at rest is given by
Question 2
The reading of differential manometer of a Venturimeter, placed at 45 ° to the horizontal is 11cm. If the Ventruimeter is turned to horizontal position, the manometer reading will be
Question 3
An average operating data for conventional activated sludge treatment plant is as follows
Waste water flow = 34000 m3/day, volume of aerator =10800m3
Influent and effluent BOD are 250 and 20 mg/l
Mixed liquor suspended solids = 2400 mg/l
Effluent suspended solid = 30 mg/l
Waste water suspended sludge = 9400 mg/l
Quantity of waste sludge = 220 m3/day .
Then calculate the sludge age in days
Question 4
Flow of waste water is 50,000 m3/day with BOD of 250 mg/l. PST has efficiency of 35% and 75% with respect to BOD and suspended solid removal respectively. KER is 0.06 per day and sludge age is 6.5 days. Mixed liquor suspended solids is 2000 mg/l and efficiency of ASP in BOD removal is 90% then calculate the volume of the aerator in m3. Take y= 0.5
Question 5
A family of 7 people generates solid waste (SW) at the rate of 0.5 kg/capita/day and the bulk density of refuse in a typical garbage can is about 160 kg/m3. If the collection is done once in a three weeks, the number of 170 litres can require for household is
Question 6
Determine quantity of air(m3) required to oxidize the waste of 500kg of MSW (C60H95O40N) by composting. Use the following equation. (assume density = 1.2Kg/m3 & % oxygen in air to be 20.8%)?
C60H95O40N + 63O2→60CO2 + 46H2O + NH3
Question 7
A rectangular sewer with width 1.5 times its depth is hydraulically equivalent to a circular one. The width of the rectangular sewer B and the diameter of the circular sewer (D) are related as D = kB(consider roof as well in wetted perimeter where k is ________ [correct to three decimal places]
Question 8
The speed-density relationship for a particular road was found to be : u = 42.76 – 0.22 k, Where u is the speed in km and k is the density in vehicles per km. capacity of the road will be-
represent the total horizontal stress, total vertical stress, effective horizontal stress and effective vertical stress on a soil element, respectively, the coefficient of earth pressure at rest is given by 
