Environmental Engineering Questions and Answers – Inverted Siphon, Storm Regulator and Sewage Pumping

This set of Environmental Engineering test focuses on “Inverted Siphon, Storm Regulator and Sewage Pumping”.

1. Which of the following is called as depressed sewer?
a) Lateral sewer
b) Outfall sewer
c) Inverted siphon
d) Main sewer

Explanation: Inverted siphon is also caused as depressed sewer as the pipes between the inlet and the outlet chamber is depressed due to obstruction like roads, bridges etc.

2. The sewage in inverted siphon will flow under __________
a) Air
b) Vacuum
c) Pressure
d) Gravity

Explanation: The sewage in inverted siphon will flow under pressure greater than the atmospheric pressure and it will not flow under gravity.

3. The design self cleansing velocity of an inverted siphon is __________
a) 0.9m/Sec
b) 0.6m/Sec
c) 0.7m/Sec
d) 0.4m/Sec

Explanation: The design self cleansing velocity of an inverted siphon is 0.9m/Sec for caring minimum, maximum and combined sanitary sewage.

4. The minimum diameter of an inverted siphon is __________
a) 5cm
b) 10cm
c) 15cm
d) 25cm

Explanation: The inverted siphon has a minimum diameter of 15cm and it is made of siphon tubes.

5. Which sewer appurtenance discharges the excess sewage flow to relief sewer?
a) Flushing tank
b) Drop manhole
c) Lamp hole
d) Storm regulators

Explanation: Storm regulators prevents the overloading of sewage treatment plants by discharging the excess sewage flow into relief sewer.
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6. Storm regulators are classified into how many types?
a) 2
b) 3
c) 4
d) 6

Explanation: Storm regulator is classified into 3 types, namely Overflow weir, Siphon spillway and Leap weir.

7. Which of the following is most effective in preventing the overloading of treatment plants?
a) Street inlets
b) Overflow weir
c) Siphon valley
d) Leap weir

Explanation: In Siphon valley, the siphonic action takes place when the sewage quantity in combined sewer exceeds the fixed level and it get stopped as soon as it falls below that fixed level.

8. Which of the following is called a sewage ejector pump?
a) Solid handling pump
b) Air lift pump
c) Diaphragm pump
d) Reciprocating pump

Explanation: Solid handling pump is also called as sewage ejector pump where pumping of raw sewage takes place which are mostly in solid form.

9. Which of the following pump is used for the removal of grit?
a) Centrifugal pump
b) Pneumatic ejector
c) Rotary screw pump
d) Air lift pump

Explanation: At Rotary screw pump, the motor rotates on a shaft to lift the solid waste material to a higher level and they are used in grit chambers for removing grit.

10. The septic tank and pump chamber should be kept as deep as possible.
a) True
b) False

Explanation: The septic tank and pump chamber should be placed at shallow depth as it will result in easier inspection, repairment and maintenance of them.

11. Which part of the pump chamber allows to easily disconnect from the pipeline?
a) Gate valve
b) Check valve
c) Union
d) Pump lift chain

Explanation: Union is a device that is placed in the pump discharge pipe that allows the pump to easily disconnect from the pipe in the pump chamber.

12. Which device warns that the liquid is above the pump level?
a) High level alarm
b) Check valve
c) Union
d) Pump lift chain

Explanation: High level alarms give a red light as a warning signal that warns the user that wastewater is above the pump level.

13. Which of the following device prevents the back flow of wastewater?
a) Gate valve
b) Check valve
c) Union
d) Pump lift chain

Explanation: Check valve allows the flow of wastewater in one direction and prevents the back flow of water.

14. Which component of the pumping chamber prevents ground water from entering the septic tank?
a) Pump lift chain
b) Access riser
c) Check valve
d) Union

Explanation: Access riser are large diameter riser with a 61cm diameter that prevents the ground and surface water from entering the septic tank.

15. Which of the following represents the correct order in terms of the maximum efficiency of the pump?
a) Centrifugal > Airlift > Diaphragm
b) Diaphragm > Airlift > Centrifugal
c) Airlift > Centrifugal > Diaphragm
d) Centrifugal > Diaphragm > Airlift

Explanation: The maximum efficiency of the centrifugal pump is 85%, while of Diaphragm and Airlift pumps are 30% and less than 25% respectively.

Sanfoundry Global Education & Learning Series – Environmental Engineering.

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