Related Questions

__________ substances present in sewage are removed in grit chamber during sewage treatment.
A Organic
B Fatty
C Inorganic
D Dissolved
During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.
A Filtration
B Digestion
C Sedimentation
D Both B and C
In a grit chamber of a sewage treatment plant,
A Flow velocity 0.15 m to 0.3 m/sec is kept
B Depth of 0.9 m to 1.20 m is kept
C One minute of detention period is kept
D All the above
The grit chambers of sewage treatment plants, are generally cleaned after
A 2 days
B 7 days
C 12 days
D 14 days
The spacing of bars of perforations of fine screens used for the treatment of sewage, is
A 2 to 3 mm
B 3 to 5 mm
C 5 to 8 mm
D 8 to 10 mm
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
The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.
A Anaerobic
B Saphrophytic
C Aerobic
D Parasitic
In large thermal power stations very fine particulates present in flue gas are removed by
A Wet scrubber
B Bag filter
C Electrostatic precipitators
D Dust catcher
Melt spinning of polymers involves the forcing of polymer melt through spinnerettes (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the __________ fibres.
A Acrylic
B Polyester
C Nylon 6:6
D Polypropylene
During preliminary treatment of a sewage
A Oil and grease are removed from skimming tanks
B Floating materials are removed by screening
C Girt and sand are removed by girt chambers
D All the above

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