Questions and answers for exam Preparation

MCQs

Total Questions : 1556 | Page 153 of 156 pages

Question 1521. The most efficient cross-section of sewers in a combined sewerage system is________________?

Parabolic
Circular
Rectangular
New egged

Discuss Question

Answer: Option B. -> Circular
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1522. The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known_________________?

Bio-Chemical Oxygen Demand (B.O.D.)
Dissolved Oxygen (D.O.)
Chemical Oxygen Demand (C.O.D.)
None of these

Discuss Question

Answer: Option B. -> Dissolved Oxygen (D.O.)
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1523. In sewers the effect of scouring is more on__________________?

Top side
Bottom side
Horizontal side
All sides

Discuss Question

Answer: Option B. -> Bottom side
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1524. Sewer ventilating columns are generally placed at_______________?

Distances 150 m to 300 m
Upper ends of branch sewers
Every change in the size of sewers
All the above

Discuss Question

Answer: Option D. -> All the above
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1525. In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is____________________?

Q/(B × D)
Q/(L × D)
Q/L
Q/(B × L)

Discuss Question

Answer: Option D. -> Q/(B × L)
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1526. If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is________________?

1 in 60
1 in 100
1 in 120
None of these

Discuss Question

Answer: Option B. -> 1 in 100
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1527. The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is_________________?

1 in 100 upward
1 in 500 upward
1 in 100 downward
1 in 503 upward

Discuss Question

Answer: Option C. -> 1 in 100 downward
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1528. The grit and silt of the grit chambers, may not be used for_________________?

Raising low lying areas by dumping
Concreting
Both A. and B.
Neither A. nor B

Discuss Question

Answer: Option B. -> Concreting
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1529. In sewers the velocity of flow should not be_________________?

More than the self-cleansing velocity
Less than the self-cleansing velocity
Less than 10 m/sec
More than 20 m/sec

Discuss Question

Answer: Option B. -> Less than the self-cleansing velocity
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1530. Dilution method of disposing of sewage, is not preferred to_______________?

When sewage is fresh
When diluting water has high dissolved oxygen content
When diluting water is used for water supply near the point of sewage disposed
When the diluting water is having flow currents

Discuss Question

Answer: Option C. -> When diluting water is used for water supply near the point of sewage disposed
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!