The operating pressure drop for the electrostatic precipitator including perforated plates varies in the range of
A.0.2 to 0.5 in. H2O g
B.3 to 60 in. H2O g
C.2 to 6 in. H2O g
D.0.01 to 0.1 in. H2O g
Category: Chemical Environmental Engineering Mcqs
The electrostatic precipitators have an efficiency characteristic which is related primarily to exposure time i.e. the period during which a dust particle is exposed to the electrostatic field. Exposure time can be increased by
A.increasing the cross-sectional area of the precipitator
B.increasing its length in the direction of gas flow
C.both a and b
D.neither a nor b
The lowest layer of atmosphere is called
A.ionosphere
B.troposphere
C.stratosphere
D.exosphere
The biochemical treatment of sewage effluents is essentially a process of
A.reduction
B.oxidation
C.dehydration
D.alkalinization
Arrange the following in ascending order of their occurrence in the atmosphere: (1) oxygen (2) Nitrogen (3) Carbon dioxide (4) Argon
A.Nitrogen Oxygen Carbon dioxide Argon
B.Argon Carbon dioxide Oxygen Nitrogen
C.Carbon dioxide Argon Oxygen Nitrogen
D.Nitrogen Oxygen Argon Carbon dioxide
For a fabric filter gas-to-fabric ratio is expressed as cubic feet per minute per square foot fabric surface area. As the gas-to-fabric ratio becomes larger
A.the size and cost of a fabric filter is correspondingly increased
B.the size and cost of a fabric fulter is correspondingly decreased
C.the size and cost of a fabric filter remains unaffected
For protection of acquatic life in a fresh water stream sewage effluent should never lower the dissolved oxygen content lower than
A.15 ppm
B.10 ppm
C.5 ppm
D.20 ppm
Gas temperature is an important consideration in the design of fabric filter because it affects
A.the gas viscosity
B.the gas density
C.the selection of fabric
D.all of the above
The operating pressure drops for a fabric filter are usually in the range of
A.0.2 to 0.5 in. H2O g
B.2 to 6 in. H2O g
C.8 to 60 in. H2O g
D.0.01 to 0.1 in. H2O g
In the electrostatic precipitator
A.high conductivity material is more easily collected
B.low conductivity material is more easily collected
C.electrical conductivity of material is not an important factor
D.none of the above
