Water Supply Engineering

291. The transitional middle portion of a logistic curve follows

1. A geometric growth
2. A logarithmic growth
3. A first over curve
4. A constant rate

View answer

292. The type of joint generally used in cast iron pipes, is

1. Socket and spigot joint
2. Flanged joint
3. Dresser coupling joint
4. All the above

View answer

293. The type of pipe commonly used in water supply distribution schemes, is

1. R.C.C. pipes
2. Hume pipes
3. Cast iron pipes
4. G.I. pipes

View answer

294. The U.C. (uniformity coefficient) D₆₀/D₁₀ for the best filter media sand should be

1. 2
2. 3
3. 4
4. 5

View answer

295. The valve fitted closely in a recess against an opening in a pipe, is generally

1. Wedge shaped circular disc
2. Spherical disc
3. Parallelepiped disc
4. Conical shaped circular disc

View answer

296. The valves provided at low points of pipes to drain off water quickly under gravity, are called

1. Blow off valves
2. Drain valves
3. Sewer valves
4. All the above

View answer

297. The water level in an open well was depressed by pumping 2.5 m and recuperated 2.87 m in 3 hours and 50 minutes. The yield of the well per minute is

1. 0.0033
2. 0.0044
3. 0.0055
4. 0.0066

View answer

298. The yield of a rapid gravity filter as compared to that of slow sand filter, is

1. 10 times
2. 15 times
3. 20 times
4. 30 times

View answer

299. Time of concentration

1. Is the time taken, for precipitation
2. Duration of rainfall
3. Time taken for all the ran off to reach the drain
4. Time taken for the storm water to travel from the most remote point to the drain

View answer

300. To control the growth of algae in reservoirs, the compound which is used, is

1. Bleaching powder
2. Copper sulphate
3. Lime solution
4. Alum solution

View answer