This set of Waste Water Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Pipes and Traps”.
1. What is the device used to prevent sewer gases from entering the buildings?
a) Filters
b) Traps
c) Ventilators
d) Vacuum pumps
View Answer
Explanation: A trap is a device which is used to prevent sewer gases from entering the buildings. The traps retain the small amount of water and are located below or within a plumbing fixture.
2. The traps should be of self cleansing pattern.
a) True
b) False
View Answer
Explanation: The traps must self-cleanse and remain clean. Good traps must contain efficient water seal under all conditions of flow.
3. The European WC contains attached trap.
a) True
b) False
View Answer
Explanation: Trap may be manufactured as an integral trap within the appliance as in some models of European WC or there may be separate trap connected to waste or foul water outlet of appliances.
4. _________ is constructed outside the building to carry wastewater discharge.
a) Gully trap
b) P. trap
c) S. trap
d) Floor trap
View Answer
Explanation: Gully traps are constructed outside the building to carry waste water discharge from washbasin, sinks, bathroom etc.
5. What is the minimum depth of water required in gully trap?
a) 10 mm
b) 20 mm
c) 40 mm
d) 50 mm
View Answer
Explanation: Gully traps are deep seal traps, the depth of water seal should be 50 mm minimum. It prevents the entry of insects from sewer line to waste pipes carrying wastewater.
6. Indian water closet generally uses ______
a) P. trap
b) Gully trap
c) Bottle trap
d) Grease trap
View Answer
Explanation: Indian water closet generally uses P. trap and they are made from cast iron or UPV sheet. It also prevents the entry of gases by water seal.
7. What is P. trap made of?
a) Polymer
b) Cast iron
c) Wrought iron
d) Plastic
View Answer
Explanation: P. traps are made from cast iron or UPV sheet. P. traps are usually used in the Indian water closets.
8. _________ is similar to P. trap.
a) Floor trap
b) S. trap
c) Intercepting trap
d) Q trap
View Answer
Explanation: S. trap is similar to P. trap and is used for fixing water closets in toilets. The only difference between P. trap and S. trap is that P. trap is used for walls containing outlets whereas S. trap is used for floor containing outlets.
9. ______ is provided on the floor to collect wastewater from various sources like sinks.
a) Nahini trap
b) Intercepting trap
c) S. trap
d) P. trap
View Answer
Explanation: Nahini trap or floor trap is provided in the floor to collect waste water from washbasin, shower, sink and bathroom etc.
10. What is the minimum depth of water seal in floor trap?
a) 25 mm
b) 50 mm
c) 75 mm
d) 100 mm
View Answer
Explanation: The floor traps are available in cast iron or UPVC material and have removable grating (JALI) on the top of the trap and minimum water depths should be 50 mm.
11. At the last main hole of building sewerage, __________ is provided.
a) Grease trap
b) Gully trap
c) Intercepting trap
d) Nahini trap
View Answer
Explanation: At the last main hole of building sewerage, intercepting trap is provided. It has a deep-water seal of 100 mm.
12. How much is the water seal in intercepting trap?
a) 50 mm
b) 100 mm
c) 150 mm
d) 200 mm
View Answer
Explanation: Intercepting trap has a deep-water seal of 100 mm. At the last main hole of building sewerage, intercepting trap is provided.
13. _______ is generally used in food processing units.
a) Intercepting trap
b) Grease trap
c) Bottle trap
d) Q trap
View Answer
Explanation: Grease trap is generally used in food processing unit. It is a device used to collect the wastes of grease contents.
14. _______ is used below sinks to prevent entry of foul gases.
a) Q trap
b) Bottle trap
c) Grease trap
d) P. trap
View Answer
Explanation: Bottle trap is used below washbasin and sinks to prevent entry of foul gases. It is almost similar to S trap and is used in the upper storey other than ground floor.
15. How deep is the water seal in the water closet?
a) 15 mm
b) 25 mm
c) 50 mm
d) 65 mm
View Answer
Explanation: Water closet is of 50 mm deep, floor trap is of 50 mm deep. Various other fixtures are connected to the stack through branch waste pipe of diameter 75 mm and 40 mm.
Sanfoundry Global Education & Learning Series – Waste Water Engineering.
To practice all areas of Waste Water Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.
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