For continuous reverse air cleaning in a fabric filter gas-to-fabric ration normally varies from
A.8 to 15 cfm/sq ft
B.0.2 to 0.5 cfm/sq ft
C.50 to 60 cfm/sq ft
D.0.01 to 0.1 cfm/sq ft
Category: Chemical Environmental Engineering Mcqs
For most industrial electrostatic precipitator installations particledrift velocity which is used to calculate the precipitation efficiency varies from
A.3 to 8 ft/s
B.0.1 to 1 ft/s
C.60 to 80 ft/s
D.15 to 20 ft/s
High absolute humidity
A.increases the explosibility of the aerosol
B.decreases the explosibility of the aerosol
C.does not change the explosibility of the aerosol
Depending on the size of the particles being collected the wet scrubbers operate in a pressure drop range from
A.0.2 to 0.5 in. H2O g
B.3 to 60 in. H2O g
C.0.01 to 0.1 in. H2O g
D.760 to 800 in. H2O g
The collection efficiency of electrostatic precipitator depends on
A.the electrode area
B.the particle drift velocity
C.the gas flow rate
D.all of the above
Man dies in an atmosphere of carbon monoxide because
A.it combines with oxygen present in the body to form carbon dioxide
B.it reduces the organic matter of tissues
C.it combines with the haemoglobin of the blood making it capable of absorbing oxygen
D.it drives up the blood
The most efficient equipment for removal of sub micron dust particles from blast furnace gas is
A.venturi scrubber
B.gravity settling chamber
C.electrostatic precipitator
D.cyclone separator
In a fabric filter the pressure drop
A.increases directly as viscosity of the gas and inversely as density of the gas
B.increases directly as density of the gas and inversely as viscosity of the gas
C.increases directly as density of the gas and independent of the viscosity of the gas
D.none of the above
The operation of a cyclone separator relies on
A.centrifugal force acting on the particle
B.producing an electric charge on the particle to be collected and then directing it by electrostatic forces to the collecting electrodes
C.the creation of intimate contact between a stream of gas and a flow of scrubbing liquor
D.diffusion of dust particles
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
