ENVIRONMENTAL ENGINEERING QUIZ

4 to 6

6 to 8

2 to 4

8 to 10

Only carbonate hardness is removed

Lime reduces the non-carbonate hardness and soda-ash removes the carbonate hardness

Lime reduces the carbonate hardness and soda-ash removes the non-carbonate hardness

Only noncarbonated hardness is removed

Maintenance and operation cost are high

None of these

BOD removal is very low

Large area is required for construction

Aerobic only

anaerobic in lower compartment and aerobic in upper compartment

Anaerobic only

Aerobic in lower compartment and anaerobic in upper compartment

A Theodolite

Sight rails and boning rods

A plane table

A compass

At a distance R/2 from the well

At a distance R from the well

None of these

Close to the well

180000 m³

150000 m³

270000 m³

100000 m³

Copper sulphate

Calcium chloride

Sodium sulphate

Sodium chloride

Average daily demand

Maximum hourly demand

Maximum hourly demand on maximum day

Maximum daily demand

2B

8B

B

4B