Waste Water Engineering Mcqs - Set 11

1)   For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by______________?

a. Kinchling
b. Lloyd Davis
c. Frubling
d. All the above
Answer  Explanation 

ANSWER: All the above

Explanation:
No explanation is available for this question!


2)   The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is______________________?

a. 213.5 cm/sec
b. 313.5 cm/sec
c. 413.5 cm/sec
d. 500 cm/sec
Answer  Explanation 

ANSWER: 313.5 cm/sec

Explanation:
No explanation is available for this question!


3)   The laying of sewers is done with____________________?

a. Magnetic compass
b. Theodolite
c. Level
d. Clinometer
Answer  Explanation 

ANSWER: Level

Explanation:
No explanation is available for this question!


4)   For detecting the nitrites in the sewage, the matching colour may be developed by adding_________________?

a. Potassium permanganate
b. Sulphuric acid and napthamine
c. Phenol-di -sulphuric acid potassium hydroxide
d. None of these
Answer  Explanation 

ANSWER: Sulphuric acid and napthamine

Explanation:
No explanation is available for this question!


5)   Fresh sewage is generally_____________________?

a. Alkaline
b. Acidic
c. Highly decomposed
d. A source of objectionable odour
Answer  Explanation 

ANSWER: Alkaline

Explanation:
No explanation is available for this question!


6)   It is customary to design a sewer for D.W.F. on the basis of________________?

a. Average demand
b. Twice the average demand
c. Thrice the average demand
d. Four times the average demand
Answer  Explanation 

ANSWER: Thrice the average demand

Explanation:
No explanation is available for this question!


7)   The following is the physical characteristic of sewage___________________?

a. Turbidity
b. Colour
c. Odour
d. All the above
Answer  Explanation 

ANSWER: All the above

Explanation:
No explanation is available for this question!


8)   For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of___________________?

a. 100 cm
b. 120 cm
c. 140 cm
d. 160 cm
Answer  Explanation 

ANSWER: 160 cm

Explanation:
No explanation is available for this question!


9)   The most dangerous pollutant in vehicular emissions is____________________?

a. CO
b. SO2
c. CO2
d. O3
Answer  Explanation 

ANSWER: CO

Explanation:
No explanation is available for this question!


10)   The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known_____________________?

a. House sewer
b. Lateral sewer
c. Branch sewer
d. Sewer outfall
Answer  Explanation 

ANSWER: Sewer outfall

Explanation:
No explanation is available for this question!


11)   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_____________________?

a. 0.30 m/sec
b. 0.35 m/sec
c. 0.40 m/sec
d. 0.45 m/sec
Answer  Explanation 

ANSWER: 0.45 m/sec

Explanation:
No explanation is available for this question!


12)   The settlement of a particle in sedimentation tank, is affected by_____________________?

a. Velocity of flow
b. Viscosity of water
c. Size and shape of solid
d. All the above
Answer  Explanation 

ANSWER: All the above

Explanation:
No explanation is available for this question!


13)   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________________?

a. 2 hours
b. 3 hours
c. 4 hours
d. 5 hours
Answer  Explanation 

ANSWER: 4 hours

Explanation:
No explanation is available for this question!


14)   The minimum recommended diameter of sewers, is_________________?

a. 5 cm
b. 10 cm
c. 15 cm
d. 20 cm
Answer  Explanation 

ANSWER: 15 cm

Explanation:
No explanation is available for this question!


15)   The suitable cross-section of sewers to carry combined flow, is__________________?

a. Circular
b. Egg shaped
c. Rectangular
d. Horse shoe shaped
Answer  Explanation 

ANSWER: Egg shaped

Explanation:
No explanation is available for this question!


16)   In sewers the highest non-scouring velocity is achieved in________________?

a. Glazed bricks sewers
b. Cast iron sewers
c. Cement concrete sewers
d. Stone ware sewers
Answer  Explanation 

ANSWER: Glazed bricks sewers

Explanation:
No explanation is available for this question!


17)   If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of__________________?

a. Degradation
b. Active decomposition
c. Recovery
d. Cleaner water
Answer  Explanation 

ANSWER: Active decomposition

Explanation:
No explanation is available for this question!


18)   For trunk and out-fall, the type of sewers generally used, is_____________________?

a. Standard egg shaped
b. Circular shaped
c. Horse shoe shaped
d. Parabolic shaped
Answer  Explanation 

ANSWER: Horse shoe shaped

Explanation:
No explanation is available for this question!


19)   The most efficient cross section of sewers in a separate sewerage system is__________________?

a. Parabolic
b. Circular
c. Rectangular
d. New egged
Answer  Explanation 

ANSWER: Circular

Explanation:
No explanation is available for this question!


20)   The stone ware sewers_________________?

a. Are used for carrying sewage and drainage from houses
b. Are manufactured from clays and shale
c. After casting are dried and burnt at temperature 150°C, 700°C and 1200°C
d. All the above
Answer  Explanation 

ANSWER: All the above

Explanation:
No explanation is available for this question!