Engineering Questions with Answers - Multiple Choice Questions

Environmental Engineering MCQ – Construction of Imhoff Tank

1 - Question

Which of the following is represented by C in the following figure?
environmental-engineering-questions-answers-construction-imhoff-tank-q1-to-q9
Figure: Imhoff tank
a) Outlet
b) Digestion chamber
c) Gas chamber
d) Sedimentation chamber

View Answer

Answer: b
Explanation: C represents the digested chamber. It is placed in the lower section of Imhoff tank.




2 - Question

 In which of the following, the settling of solids takes place in the following figure?
environmental-engineering-questions-answers-construction-imhoff-tank-q1-to-q9
Figure: Imhoff tank
a) Outlet
b) Digestion chamber
c) Gas chamber
d) Sedimentation chamber

View Answer

Answer: d
Explanation: The settling of solids takes place at the sedimentation chamber. It is represented by D in the above figure.




3 - Question

The maximum flow through the period at D in the following figure?
environmental-engineering-questions-answers-construction-imhoff-tank-q1-to-q9
Figure: Imhoff tank
a) 0.3m/min
b) 0.4m/min
c) 0.8m/min
d) 0.9m/min

View Answer

Answer: a
Explanation: The maximum flow through the period at D is 0.3m/min and its design depth should be between 3 to 3.5 m.




4 - Question

 The sludge is digested in which of the following?
environmental-engineering-questions-answers-construction-imhoff-tank-q1-to-q9
Figure: Imhoff tank
a) Outlet
b) Sedimentation chamber
c) Gas chamber
d) Digestion chamber

View Answer

Answer: d
Explanation: The sludge is digested in the digestion chamber. Its minimum design capacity is 57 liters per person.




5 - Question

 The gas chamber in the below figure is represented by _____________
environmental-engineering-questions-answers-construction-imhoff-tank-q1-to-q9
Figure: Imhoff tank
a) A
b) E
c) B
d) C

View Answer

Answer: b
Explanation: The gas chamber is represented by the E in the figure. It is located at the sides of the Imhoff tank.




6 - Question

The sewage comes in the Imhoff tank through which of the following?
environmental-engineering-questions-answers-construction-imhoff-tank-q1-to-q9
Figure: Imhoff tank
a) A
b) B
c) C
d) D

View Answer

Answer: a
Explanation: A represents the inlet through which the sewage enters the Imhoff tank.




7 - Question

The detention period of the sedimentation chamber of an Imhoff tank is?
environmental-engineering-questions-answers-construction-imhoff-tank-q1-to-q9
Figure: Imhoff tank
a) 30 seconds
b) 30 minute
c) 1 hour
d) 2 hours

View Answer

Answer: d
Explanation: The detention period of the sedimentation chamber of an Imhoff tank is 2 hours. It is represented by D as shown in the figure.




8 - Question

B in the following figure is represented by ____________
environmental-engineering-questions-answers-construction-imhoff-tank-q1-to-q9
Figure: Imhoff tank
a) Outlet
b) Sedimentation chamber
c) Gas chamber
d) Digestion chamber

View Answer

Answer: a
Explanation: B represents the outlet of Imhoff tank. It carries the partially treated sewage.




9 - Question

Which of the following is called a scum chamber in the following figure?
environmental-engineering-questions-answers-construction-imhoff-tank-q1-to-q9
Figure: Imhoff tank
a) Settling chamber
b) Sedimentation chamber
c) Gas chamber
d) Digestion chamber

View Answer

Answer: c
Explanation: Gas chamber is also called a scum chamber. The minimum design width of the gas chamber is 60cm.

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