Waste Water Engineering Mcqs - Set 6

1)   The first stage of neutral process of sludge digestion, is__________________?

a. Acid fermentation
b. Acid regressio
c. Alkaline fermentation
d. None of these
Answer  Explanation 

ANSWER: Acid fermentation

Explanation:
No explanation is available for this question!


2)   The formula V = (1/n) r2/3____________________?

a. Chezy’s formula
b. Bazin’s formula
c. Kutter’s formula
d. Manning’s formula
Answer  Explanation 

ANSWER: Manning’s formula

Explanation:
No explanation is available for this question!


3)   The maximum diameter of sewers adopted in the designs is_______________?

a. 1.0 m
b. 2.0 m
c. 3.0 m
d. 4.0 m
Answer  Explanation 

ANSWER: 3.0 m

Explanation:
No explanation is available for this question!


4)   Facultative bacteria survive in_____________________?

a. The presence of oxygen
b. The absence of oxygen
c. Both cases A. and B.
d. Neither A. nor B.
Answer  Explanation 

ANSWER: Both cases A. and B.

Explanation:
No explanation is available for this question!


5)   The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is____________________?

a. 20 m
b. 30 m
c. 45 m
d. 75 m
Answer  Explanation 

ANSWER: 45 m

Explanation:
No explanation is available for this question!


6)   The underground sewers are more subjected to________________?

a. Tensile force
b. Compressive force
c. Bending force
d. Shearing force
Answer  Explanation 

ANSWER: Compressive force

Explanation:
No explanation is available for this question!


7)   Ventilating shafts are provided to a sewer line at every__________________?

a. 100 m
b. 150 m
c. 200 m
d. 300 m
Answer  Explanation 

ANSWER: 300 m

Explanation:
No explanation is available for this question!


8)   Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is__________________?

a. pt = 3H3p/2 Z5
b. pt = 2H3p/3 Z5
c. pt = 3H3p/2Z5
d. pt = 2 3p/3Z5
Answer  Explanation 

ANSWER: pt = 3H3p/2 Z5

Explanation:
No explanation is available for this question!


9)   For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed________________?

a. 1.5
b. 2.0
c. 2.5
d. 3.0
Answer  Explanation 

ANSWER: 1.5

Explanation:
No explanation is available for this question!


10)   If the pH value of sewage is 7__________________?

a. It is acidic
b. It is alkaline
c. It is neutral
d. None of these
Answer  Explanation 

ANSWER: It is neutral

Explanation:
No explanation is available for this question!


11)   The normal values of over flow rates for secondary sedimentation tanks, ranges between__________________?

a. 25,000 to 35,000 litres/sqm/day
b. 40,000 to 50,000 litres/sqm/day
c. 50,000 to 60,000 litres/sqm/day
d. 80,000 to 10,000 litres/sqm/day
Answer  Explanation 

ANSWER: 25,000 to 35,000 litres/sqm/day

Explanation:
No explanation is available for this question!


12)   The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is __________________?

a. 5 m
b. 5.5 m
c. 6.5 m
d. 7 m
Answer  Explanation 

ANSWER: 7 m

Explanation:
No explanation is available for this question!


13)   For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is____________________?

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

ANSWER: Glazed bricks sewers

Explanation:
No explanation is available for this question!


14)   The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is____________________?

a. 1.5
b. 2.0
c. 3.0
d. 4.0
Answer  Explanation 

ANSWER: 1.5

Explanation:
No explanation is available for this question!


15)   Large diameter sewers subjected to external pressure alone, are reinforced ______________________?

a. Near the inner surface of the pipe
b. Near the outer surface of the pipe
c. Both A. and B.
d. With elliptical cage
Answer  Explanation 

ANSWER: With elliptical cage

Explanation:
No explanation is available for this question!


16)   The liquid wastes from kitchens, bath rooms and wash basins, is not called________________?

a. Liquid waste
b. Sullage
c. Sewage
d. None of these
Answer  Explanation 

ANSWER: Sewage

Explanation:
No explanation is available for this question!


17)   The detention time (t) of a settling tank, may be defined as the time required for_________________?

a. A particle to travel along its length
b. A particle to travel from top surface to bottom sludge zone
c. The flow of sewage to fill the tank
d. None of these
Answer  Explanation 

ANSWER: The flow of sewage to fill the tank

Explanation:
No explanation is available for this question!


18)   The effluent of a septic tank is_________________?

a. Fit for discharge into any open drain
b. Foul and contains dissolved and suspended solids
c. As good as that from a complete treatment
d. None of these
Answer  Explanation 

ANSWER: Fit for discharge into any open drain

Explanation:
No explanation is available for this question!


19)   The design period of sewage treatment works in normally_________________?

a. 5 – 10 years
b. 15 – 20 years
c. 30 – 40 years
d. 40 – 50 years
Answer  Explanation 

ANSWER: 15 – 20 years

Explanation:
No explanation is available for this question!


20)   In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is_______________?

a. D
b. D /2
c. D/3
d. D/4
Answer  Explanation 

ANSWER: D/4

Explanation:
No explanation is available for this question!