Top 250+ Solved Waste Water Treatment MCQ Questions Answer
Q. What is the specific gravity of settleable particles in the grit chamber?
a. 2.98
b. 2.56
c. 2.65
d. 2.89
Q. Stoke’s law holds good for Reynolds’s number ______
a. Less than 1
b. Equal to 1
c. Greater than 1
d. Nearer to 1
Q. What is the horizontal velocity considered for grit chamber?
a. 0.25-0.4m/sec
b. 0.6-0.9 m/sec
c. 1-2 m/sec
d. 3-4m/sec
Q. What is the detention time considered for aerated grit chamber?
a. 5-6 mins
b. 2-5 mins
c. 1-2 mins
d. 3-4 mins
Q. Which of these is not a grit removal equipment installed in the aerated grit chamber?
a. Screw conveyers
b. Tubular conveyers
c. Jet pumps
d. Communitors
Q. What is the amount of air supplied for these grit chambers?
a. 1-2 m3/m.min
b. 0.2-0.5 m3/m.min
c. 0.5-0.8 m3/m.min
d. 0.8-1 m3/m.min
Q. At what depth are the air diffusers placed in the grit chamber?
a. 0.6-0.9 m
b. 1-2 m
c. 0.1-0.4m
d. 0.45-0.6 m
Q. What is the amount of grit quantities captured by the aerated grit chamber?
a. 0.004-0.20 m3/103.m3
b. 0.25 m3/103.m3
c. <0.004 m3/103.m3
d. 0.5 m3/103.m3
Q. Usually while designing what is the range of the width of the aerated grit chamber assumed?
a. 0.5-2 m
b. 8-10 m
c. 2.5-7.0m
d. 12m
Q. Usually while designing what is the range of length of the aerated grit chamber assumed?
a. 7.5-20
b. 4-6 m
c. 25 m
d. 50 m
Q. Usually while designing what is the range of depth of the aerated grit chamber assumed?
a. 0.5-2 m
b. 8-10 m
c. 2-5 m
d. 12 m
Q. Aerated grit chambers are usually designed to remove particles in which range of size?
a. 0.1mm diameter
b. 0.35 mm diameter
c. 0.21 mm diameter
d. 0.41 mm diameter
Q. Activated sludge process degrade organics and _________
a. Improve nutrients
b. Remove nutrients
c. Remove odour
d. Remove taste
Q. What is required to keep the activated sludge suspended?
a. Carbon-dioxide
b. Nitrogen
c. Oxygen
d. Ammonia