When there is no recirculation of sewage, then recirculation factor is

During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.

A

Filtration

B

Digestion

C

Sedimentation

D

Both B and C

Fine grit present in sewage is removed in the __________ during sewage treatment.

A

Grit chamber

B

Detritus tank

C

Trickling filter

D

Skimming tank

__________ substances present in sewage are removed in grit chamber during sewage treatment.

A

Organic

B

Fatty

C

Inorganic

D

Dissolved

Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is?

A

Centrifugal pump

B

Pneumatic ejector

C

Reciprocating pump

D

None of these

Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is

A

H₂

B

CH₄

C

CO₂

D

N₂

Which of the following pumps is used to pump sewage solids with liquid sewage without clogging the pump is?

A

Centrifugal pump

B

Pneumatic ejector

C

Reciprocating pump

D

None of these

Forced recirculation of furnace gases is practised

A

To increase heat transfer by convection

B

To ensure uniform temperature

C

In furnaces, operating below 750°C

D

All of the above

The type of pump used for the recirculation of molten sodium coolant in liquid metal cooled reactor is a/an __________ pump.

A

Electromagnetic

B

Reciprocating

C

Centrifugal

D

Volute

In forced recirculation type boiler,

A

Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

B

Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

C

Feed pump is employed to supplement natural circulation in water wall type furnace

D

Water is converted into steam in one pass without any recirculation

The factor responsible for purification of sewage in river is

A

Hydrology

B

Dissolved oxygen in water

C

Temperature

D

All the above

When there is no recirculation of sewage, then recirculation factor is

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