Waste Water Engineering

181. The average temperature of sewage in India, is

1. 10°C
2. 15°C
3. 20°C
4. 25°C

View answer

182. The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope

1. 1 in 5
2. 1 in 10
3. 1 in 15
4. 1 in 20

View answer

183. The Brake Horse power of the motor (efficiency 60%) required for a pump of capacity 0.075 cumec for a total lift of 12 m, is

1. 10
2. 15
3. 20
4. 25

View answer

184. The Chezy's constant C in the formula V = C √rs depends upon

1. Size of the sewer
2. Shape of the sewer
3. Roughness of sewer surface
4. All the above

View answer

185. The clarigesters are

1. Circular septic tanks
2. Rectangular septic tanks
3. Circular Imhoff double tanks with bottom hoppers
4. Circular Imhoff double storey tanks without bottom hoppers

View answer

186. The coagulant which is generally not used for treating the sewage, is

1. Alum
2. Ferric chloride
3. Ferric sulphate
4. Chlorinated copperas

View answer

187. The coagulant widely used for sewage treatment, is

1. Alum
2. Ferric chloride
3. Ferric sulphate
4. Chlorinated copperas

View answer

188. The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is

1. 0.05552 cumec
2. 0.05554 cumec
3. 0.05556 cumec
4. 0.0556 cumec

View answer

189. The design period in years for pumping plants, is

1. 1
2. 2 to 3
3. 3 to 5
4. 5 to 10

View answer

190. The design period of sewage treatment works in normally

1. 5 - 10 years
2. 15 - 20 years
3. 30 - 40 years
4. 40 - 50 years

View answer