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311.

The treatment which employs mechanical and hydraulic separation principles is referred as secondary treatment.

Yes

312.

In preliminary treatment of sewage, the operation which takes place, is

A.	removal of fine suspended particles	B.	removal of fine dissolved organic material
C.	removal of lighter floating material	D.	removal of harmful bacterias and other organisms

313.

In secondary treatment of sewage, the operation which takes place is

A.	removal of heavier suspended inorganic material	B.	removal of fine dissolved organic material
C.	removal of harmful bacterias	D.	all of the above

314.

The secondary treatment of sewage is carried out by the use of

A.	screens	B.	grit chambers
C.	trickling filters	D.	chlorinators

315.

In primary settling tank, suspended solids are reduced from

A.	10 to 20%	B.	20 to 40%
C.	40 to 70%	D.	70 to 90%

316.

In high rate activated sludge treatment, bacterias are removed from

A.	20 to 40%	B.	40 to 60%
C.	60 to 80%	D.	80 to 95%

317.

Grit chambers of a sewage plant are usually changed after

A.	1 day	B.	1 week
C.	2 weeks	D.	4 weeks

318.

Grit chambers are used to remove sand and other organic matter from sewage.

Agree

Disagree

319.

Grit should be removed from sewage before

A.	their disposal in dilution water	B.	their lifting by means of pump etc.
C.	settling of sewage in sedimentation tank	D.	all of the above

320.

Biological action is used in

A.	screens	B.	sedimentation tanks
C.	trickling filters	D.	all of these