1. If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is
2. The non-clog pump which permits solid matter to pass out with the liquid sewage, is
3. Assertion (A) : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable. Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities.
4. The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is
5. In olden days the type of section adopted in trunk and out fall sewers was
6. For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed
7. In a fully mechanised composting plant, involves
8. If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is
9. An inverted siphon is designed generally for
10. A rainfall may be classified as acidic if its pH value is less or equal to
11. When drainage to sewage ratio is 20, the peak dry weather flow is
12. For treating the sewage of a large city, you will recommend
13. Which of the following American President is related with “Gettysberg speech”?
14. The dimensions of a rectangular settling tank are : length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is
15. The screens are fixed
16. In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is
17. Clogging of sewers, is caused due to
18. A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is
19. The coagulant widely used for sewage treatment, is
20. House connections to the laterals is generally made by
21. The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is
22. Dilution method of disposing off sewage, is not preferred to
23. For house drainage minimum gradient is
24. If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is
25. The ratio of minimum hourly flow to the average flow of sewage is