500 Best Environmental Engineering- MCQ
Q101). The sand used for filteration, should not loose weight more than ………… when placed in hydrochloric acid for 24 hours
a).0.025
b).0.05
c).0.075
d).0.1
Correct Answer:
0.05
Explanation:
Q102). The effective size of sand particles for slow sand filters varies from
a).0.30 to 0.35
b).0.35 to 0.50
c).0.50 to 0.65
d).0.65 to 0.75
Correct Answer:
0.30 to 0.35
Explanation:
Q103). The effective size of sand particles for rapid sand filters varies from
a).0.30 to 0.35
b).0.35 to 0.50
c).0.50 to 0.65
d).0.65 to 0.75
Correct Answer:
0.35 to 0.50
Explanation:
Q104). The coefficient of uniformity for slow sand filters is
a).1.35
b).1.55
c).1.75
d).2.05
Correct Answer:
1.75
Explanation:
Q105). The under drainage system in slow sand filters
a).Receives and collects the filtered water
b).Allows back washing for cleaning the filter
c).Both A and B
d).None of these
Correct Answer:
Receives and collects the filtered water
Explanation:
Q106). The under drainage system in a rapid sand filters
a).Receives and collects the filtered water
b).Allows back washing for cleaning the filter
c).Both A and B
d).None of these
Correct Answer:
Both A and B
Explanation:
Q107). Which of the following statement is correct?
a).Slow sand filters work under atmospheric pressure
b).Rapid sand filters require coagulation
c).Rapid sand filters should be cleaned after 2 to 3 days
d).All of the above
Correct Answer:
All of the above
Explanation:
Q108). The slow sand filter should be cleaned if the loss of head becomes more than
a).0.75 m
b).1.2 m
c).2.2 m
d).3.5 m
Correct Answer:
1.2 m
Explanation: