This set of Waste Water Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Systems of Plumbing”.
1. How many types of pumps are present?
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: Pumps are of two types. Submersible pumps and open type pumps. Submersible pumps require very less maintenance and are used inside water. Both types can be used for traditional as well as hydro-pneumatic system.
2. Submersible pumps require high maintenance.
a) True
b) False
View Answer
Explanation: Submersible pumps require very less maintenance and are used inside water. Both types can be used for traditional as well as hydro-pneumatic system.
3. What is the minimum diameter of pipes used for drainage of waste water?
a) 50 mm
b) 75 mm
c) 100 mm
d) 105 mm
View Answer
Explanation: Waste water is from showers, basins, kitchen sinks, washing machines and the like. This is also called grey water. Normally a minimum of 75 mm diameter pipes is used for drainage of waste water.
4. What is the wastewater from kitchen sinks called?
a) Grey water
b) Black water
c) Yellow water
d) Brown water
View Answer
Explanation: Normally a minimum of 75 mm diameter pipes are used for drainage of waste water. Waste water is from showers, basins, kitchen sinks, washing machines and the like. This is also called grey water.
5. What is the water from urinals called?
a) Black water
b) Yellow water
c) Grey water
d) Brown water
View Answer
Explanation: Soil water or sewage is from WCs and urinals. This is also called black water. Minimum of 100 mm diameter pipes are used for waste water. These can be of cast iron or of PVC.
6. What is the minimum diameter of the pipe used to collect black water?
a) 50 mm
b) 75 mm
c) 100 mm
d) 125 mm
View Answer
Explanation: Soil water or sewage is from WCs and urinals. This is also called black water. Minimum of 100 mm diameter pipes are used for waste water.
7. What is the recommended slope ratio for soil water pipes?
a) 1:12
b) 1:20
c) 1:30
d) 1:40
View Answer
Explanation: Soil water pipes should run at a steeper slope, such as 1:40, as they have solids. These can be of cast iron or of PVC. Minimum of 100 mm diameter pipes are used for waste water.
8. Grease should not be allowed to enter the normal drainage system.
a) True
b) False
View Answer
Explanation: A grease trap should be used when draining waste from kitchens, grease should not be allowed to enter the normal drainage system. A grease trap is nothing but a small inspection chamber.
9. _______ is used to clean blockage in the line.
a) Lateral chamber
b) Main chamber
c) Inspection chamber
d) Sewer chamber
View Answer
Explanation: Tone ware (ceramic) pipes are used when soil and waste water is to be transported in external soil. An inspection chamber is used to clean blockage in the line and change direction of pipes.
10. What is the shape of the septic tank?
a) Square
b) Rectangle
c) Circular
d) Oval
View Answer
Explanation: A septic tank is a rectangular underground tank with compartments. It is always full of sewage that can be removed manually. The less water put into a septic tank, the better it will function.
11. What is the percentage of purification of septic tank effluent?
a) 30%
b) 50%
c) 70%
d) 90%
View Answer
Explanation: The effluent that flows out of this, which is about 70% purified, is then put into a soak pit. A soak pit is a cylindrical tank with porous brick walls surrounded by a layer of gravel.
12. ________ should not be placed near water body.
a) Power generator
b) Soak pit
c) Pump stations
d) Houses
View Answer
Explanation: A soak pit should not be placed near any occupied structure, water body or water supply pipe. The groundwater will enter and flood the pit through the porous walls. Hence, soak pit cannot be used where the water table is high.
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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