Waste Water Engineering — Part 2 MCQs with Explanations

All the above is the correct answer to “Are available in size Stoneware sewers”. This question is standard in competitive examination syllabi for Waste Water Engineering.

All the above is the correct answer to “Oxidation process results in the formation of”. This question is standard in competitive examination syllabi for Waste Water Engineering.

> 1.5 m is the correct answer to “The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be”. This question is standard in competitive examination syllabi for Waste Water Engineering.

0.45 m/sec is the correct answer to “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”. This question is standard in competitive examination syllabi for Waste Water Engineering.

$$\left( {\frac{{100 - {{\text{p}}_1}}}{{100 - {{\text{p}}_2}}}} \right){{\text{V}}_1}$$ is the correct answer to “In a sludge digestion tank if the moisture content of sludge V 1 litres is reduced from p 1 % to p 2 % the volume V 2 is”. This question is standard in competitive examination syllabi for Waste Water Engineering.

15 cm is the correct answer to “The minimum diameter of sewer to be adopted is”. This question is standard in competitive examination syllabi for Waste Water Engineering.

All the above is the correct answer to “In a grit chamber of a sewage treatment plant,”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Biological action is used is the correct answer to “In a trickling filter”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Trickling filters is the correct answer to “The sewage treatment units in which anaerobic decomposition of organic matter is used, are called”. This question is standard in competitive examination syllabi for Waste Water Engineering.

0.013 is the correct answer to “The porosity of sediments in sewer pipes, is usually taken as”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Toilets is the correct answer to “The sludge does not contain waste water from”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Water supply allowance per capita is the correct answer to “Dry weather flow is:”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Potentiometer is the correct answer to “The pH value of sewage is determined with the help of”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Invert level of a branch sewer is more than 60 cm that of the main sewer is the correct answer to “Drop manholes at the junctions of sewer lines, are provided if”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Thrice the average demand is the correct answer to “It is customary to design a sewer for D.W.F. on the basis of”. This question is standard in competitive examination syllabi for Waste Water Engineering.

60 to 80% is the correct answer to “In trickling filter, B.O.D. is reduced to”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Bazin’s formula is the correct answer to “The value of Chezy’s constant $${\text{C}} = \frac{{157.6}}{{1.81 + \frac{{\text{K}}}{{\sqrt {\text{m}} }}}}$$ is used in”. This question is standard in competitive examination syllabi for Waste Water Engineering.

45 m is the correct answer to “The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Manning is the correct answer to “If n is the rugosity coefficient, r is the hydraulic depth, s is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula $${\text{V}} = \frac{1}{{\text{n}}}{{\text{r}}^{\frac{2}{3}}}{{\text{s}}^{\frac{1}{2}}}$$ evolved by”. This question is standard in competitive examination syllabi for Waste Water Engineering.

$$\frac{{\text{Q}}}{{{\text{B}} \times {\text{L}}}}$$ is the correct answer to “In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Both A. and B. is the correct answer to “Maximum permissible velocity 1.5 m/sec, is adopted in drains”. This question is standard in competitive examination syllabi for Waste Water Engineering.

All the above is the correct answer to “Aerobic bacterias”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Storm sewage is the correct answer to “The quantity of liquid waste which flows in sewers during the period of rainfall, is known”. This question is standard in competitive examination syllabi for Waste Water Engineering.

0.75 m/sec is the correct answer to “To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Sulphur-dioxide is the correct answer to “Which one of the following gases is most significant as air pollutant”. This question is standard in competitive examination syllabi for Waste Water Engineering.

5 days is the correct answer to “The standard B.O.D. of water is taken for”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Fertilizer is the correct answer to “Dried sewage after treatment is used as”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Out-fall sewer is the correct answer to “The sewer which transports the sewage to the point of treatment, is called”. This question is standard in competitive examination syllabi for Waste Water Engineering.

All the above is the correct answer to “The temperature affects the”. This question is standard in competitive examination syllabi for Waste Water Engineering.

0.15 cumec is the correct answer to “The drainage area of a town is 12 hectares. Its 40% area is hard pavement (K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula $${{\text{P}}_{\text{s}}} = \frac{{900}}{{{\text{t}} + 60}}$$ the maximum run off is”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Anaerobic decomposition is the correct answer to “The sewage treatment in septic tanks is due to”. This question is standard in competitive examination syllabi for Waste Water Engineering.

The depth of tank is kept equal to its width is the correct answer to “Which one of the following statements regarding septic tanks is wrong”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Active decomposition is the correct answer to “If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of”. This question is standard in competitive examination syllabi for Waste Water Engineering.

All the above is the correct answer to “The asbestos cement sewers are”. This question is standard in competitive examination syllabi for Waste Water Engineering.

D’ = 0.84 D is the correct answer to “If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is”. This question is standard in competitive examination syllabi for Waste Water Engineering.

$$\pi {{\text{D}}^{\frac{8}{3}}} = 4{{\text{b}}^{\frac{8}{3}}}$$ is the correct answer to “D is the diameter of a circular sewer and $$\alpha $$ is the side of a square section sewer. If both are hydraulically equivalent, the relationship which holds good, is”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen is the correct answer to “Nitrogen cycle of sewage, is”. This question is standard in competitive examination syllabi for Waste Water Engineering.

None of these is the correct answer to “Discrete or granular particles change their”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Egg shaped is the correct answer to “The suitable cross-section of sewers to carry combined flow, is”. This question is standard in competitive examination syllabi for Waste Water Engineering.

Both cases A and B is the correct answer to “Facultative bacteria survive in”. This question is standard in competitive examination syllabi for Waste Water Engineering.