The fabric used in a fabric filter is selected on the basis of
A.temperature
B.chemical resistance
C.dust concentration
D.all of the above
Category: Chemical Environmental Engineering Mcqs
In the design of grit chambers
A.temperature is an important factor
B.the maximum velocity of flow is 1 ft/s
C.the detention period should be at least 30 min
D.there should be a 5 to 1 ration of length to depth
Which of the following devices of particulate collection from a stream gas does not discharge the particulates collected as a dry solid?
A.Cyclone separator
B.Electrostatic precipitator
C.Wet scrubber
D.Fabric filter
For heavy duty industrial type electrostatic precipitator
A.from 30000 to 100000 volts dc is normally required
B.from 240 to 440 volts dc is normally required
C.from 13000 to 18000 volts dc is normally required
D.from 1000 to 5000 volts dc is normally required
The collection efficiency of a cyclone separator
A.is directly proportional to the mass of the dust particle
B.is inversely proportional to the radius of the dust particle path
C.increases with increase in gas flow rate
D.all of the above
The most suitable equipment for removing the fine dust particle (<1micron diameter) from air below its dew point will be
A.bag filter
B.electrostatic precipitator
C.cyclone separator
D.wet scrubber
Most of the bacteria in sewage are
A.pathogenic
B.anaerobic
C.saprophytic
D.parasitic
The collection efficiency of electrostatic precipitator
A.increases with increase in the electrode area
B.increases with increase in the particle drift velocity
C.decreases with increase in the gas flow rate
D.all of the above
In treating turbine water a popular coagulant is
A.calcium sulphate
B.chlorine
C.ferric sulphate
D.iodine
The ratio of oxygen available to the oxygen required for stabilization of sewage is called
A.biochemical oxygen demand
B.relative stability
C.bacterial-stability factor
D.oxygen-ion concentration
