The digested sludge from septic tanks, is removed after a maximum period of 3 ye

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Question
The digested sludge from septic tanks, is removed after a maximum period of
Options
A. 3 years
B. 3.5 years
C. 4 years
D. 5 years.

Correct Answer

3 years

More questions

1. The direct shear test suffers from the following disadvantage:
Options
A. Drain condition cannot be controlled
B. Pore water pressure cannot be measured
C. Shear stress on the failure plane is not uniform.
D. The area under the shear and vertical loads does not remain constant throughout the test
E. All the above.

4. The useful moisture of soil, is equal to its
Options
A. field capacity
B. saturation capacity
C. moisture content at permanent wilting point
D. difference between filed capacity and permanent wilting point within the root zone of plants.

5. An excess of flaky particles in concrete aggregates
Options
A. decreases the workability
B. increases the quantity of water and sand
C. affects the durability of concrete
D. more than 15% are not desirable
E. all the above.

9. In the method of voids for determination of the quantity of cement paste, it is assumed that
Options
A. Voids in coarse aggregates are filled by fine aggregates
B. Voids in fine aggregates are filled by the cement paste
C. Volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra
D. Volume of cement paste required is equal to total volume of voids in fine aggregates plus 15% extra
E. All the above.

10. Critical time for developing a water hammer, is the time required for
Options
A. closing the valve
B. the wave to travel from valve to the reservoir
C. the wave to travel from the valve to the reservoir and back
D. none of these.

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