500 Best Irrigation Engineering MCQ
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:
Q109). After cleaning the slow sand filter, the filtered water should not be used for a period of
a).Upto 6 hours
b).6 hours to 12 hours
c).12 hours to 24 hours
d).24 hours to 48 hours
Correct Answer:
24 hours to 48 hours
Explanation:
Q110). Cleaning period of a slow sand filter is taken as
a).1 hour to 3 hours
b).1 day to 3 days
c).1 week to 3 weeks
d).1 month to 3 months
Correct Answer:
1 month to 3 months
Explanation:
Q111). Rate of filteration of a slow sand filter ranges from
a).10 to 100 l/h/m2
b).100 to 200
c).200 to 400
d).400 to 1000
Correct Answer:
100 to 200
Explanation:
Q112). Slow sand filter is efficient to remove the bacterias from the raw water to an extent of
a).0.5
b).0.7
c).0.85
d).0.99
Correct Answer:
0.99
Explanation: