Related Questions

The overflow rate for plain sedimentation tanks is about
A 500 to 750 liters/hour/m2
B 1000 to 1250 liters/hour/m2
C 1250 to 1500 liters/hour/m2
D 1500 to 2000 liters/hour/m2
The detention period for plain sedimentation water tanks, is usually
A 4 to 8 hours
B 8 to 16 hours
C 16 to 24 hours
D 24 to 36 hours
The detention period in coagulation tanks is usually kept as
A 1 to 2 minutes
B 30 to 45 minutes
C 2 to 6 hours
D 2 to 6 days
In a sedimentation tank, the detention period for water ranges from __________ hours.
A 2 to 4
B 8 to 12
C 16 to 20
D 24 to 32
Generally the detention period for grit chambers is kept as
A 1 minute
B 5 minutes
C 24 hours
D 12 hours
Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about
A 10 to 25
B 50
C 75
D 100
The normal value of over flow rates for plain primary sedimentation tanks, ranges between
A 25,000 to 35,000 litres/sqm/day
B 40,000 to 50,000 litres/sqm/day
C 50,000 to 60,000 litres/sqm/day
D 80,000 to 100,000 litres/sqm/day
Four subjects ---physics, Chemistry, Mathematics and Biology ---were taught in four consecutive periods of one hour each starting from 8.00 a.m. At what time was the chemistry period scheduled? 1. Mathematics period ended at 10.00 a.m, which was preceded by Biology. 2. Physics was scheduled in the last period. 3. Mathematics period was immediately followed by Chemistry.
A Only 1
B Only 2
C Only 2 and 3
D Only 1 and either 2 or 3
The recommended detention period for grit chambers is
A 1 minute
B 2 minutes
C 3 minutes
D 5 minutes
The detention period in a septic tank is assumed
A 20 minutes
B 25 minutes
C 30 minutes
D 40 minutes

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