WASTEWATER ENGINEERING
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1. Screening and comminution are preliminary treatment processes.
a) True
b) False
Answer: (a)
2. _____ devices remove materials which would damage equipment or interfere with a process.
a) Grit
b) Screening
c) Oxidation
d) Reduction
Answer: (b)
3. __________ represents the heavier inert matter in wastewater.
a) Debris
b) Waste
c) Screens
d) Grit
Answer: (d)
4. Supplemental means of aeration are often employed with an equalization basin to provide
better mixing.
a) True
b) False
Answer: (a)
5. Which of the following should be provided in the case where aeration is absent?
a) Screening devices
b) Mechanical mixers
c) Grit removers
d) Sedimentation tank
Answer: (b)
6. Which process is employed to gain sufficient head for the wastewater?
a) Screening
b) Pumping
c) Oxidation
d) Fermentation
Answer: (b)
7. What is the most common used coagulant?
a) Alum
b) Ferric sulphate
c) Limestone
d) Coal
Answer: (a)
8. What is the intermediate zone composed of in aerobic-anaerobic ponds?
a) Algae
b) Aerobic bacteria
c) Facultative bacteria
d) Organic solids
Answer: (c)
9. Nitrification efficiency is significantly suppressed as the temperature is _________
a) Increased
b) Decreased
c) Neutral
d) Maintained
Answer: (B)
10. __________ is a process which involves further removal of the nitrogen.
a) Nitrification
b) Denitrification
c) Ammonification
d) Reduction
Answer: (b)