Environmental Engineering Mcqs
This set of Engineering Multiple Choice Questions & Answers (MCQs) focuses on “ Environmental Engineering ”. These Mcqs are chosen from a collection of most authoritative and best reference books on Chemical Engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Environmental Engineering Mcqs comprehensively.
32. For heavy duty industrial type electrostatic precipitator
From 30000 to 100000 volts dc is normally required
From 240 to 440 volts dc is normally required
From 13000 to 18000 volts dc is normally required
From 1000 to 5000 volts dc is normally required
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33. 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
The size and cost of a fabric filter is correspondingly increased
The size and cost of a fabric fulter is correspondingly decreased
The size and cost of a fabric filter remains unaffected
B
34. Gas temperature is an important consideration in the design of fabric filter because it affects
The gas viscosity
The gas density
The selection of fabric
All of the above
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35. In a fabric filter the pressure drop
Increases directly as viscosity of the gas and inversely as density of the gas
Increases directly as density of the gas and inversely as viscosity of the gas
Increases directly as density of the gas and independent of the viscosity of the gas
None of the above
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36. The resistance offered by filter used in a fabric filter
Varies inversely as the particle size and directly as the dust concentration
Varies inversely as the dust concentration and directly as the particle size
Varies directly as the particle size as well as the dust concentration
Varies inversely as the particle size as well as the dust concentration
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37. The operating pressure drops for a fabric filter are usually in the range of
0.2 to 0.5 in. H2O g
2 to 6 in. H2O g
8 to 60 in. H2O g
0.01 to 0.1 in. H2O g
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38. Depending on the size of the particles being collected the wet scrubbers operate in a pressure drop range from
0.2 to 0.5 in. H2O g
3 to 60 in. H2O g
0.01 to 0.1 in. H2O g
760 to 800 in. H2O g
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39. Which of the following devices of particulate collection is the least efficient?
Cyclone separator
Electrostatic precipitator
Fabric filter
Wet scrubber
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40. For any particular dust concentration in the feed stream to a fabric filter increasing the gas-to-fabric ratio will
Result in an increased pressure drop
Result in decreased pressure drop
Not affect the pressure drop
A
41. For continuous reverse air cleaning in a fabric filter gas-to-fabric ration normally varies from
8 to 15 cfm/sq ft
0.2 to 0.5 cfm/sq ft
50 to 60 cfm/sq ft
0.01 to 0.1 cfm/sq ft
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42. The fabric used in a fabric filter is selected on the basis of
Temperature
Chemical resistance
Dust concentration
All of the above
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43. Which of the following devices of particulate collection from a stream gas does not discharge the particulates collected as a dry solid?
Cyclone separator
Electrostatic precipitator
Wet scrubber
Fabric filter
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44. Which of the following is not a natural source of air pollution ?
Volcanic eruptions and lightening discharges
Biological decay of vegetable matter
Photochemical oxidation of organic matter
None of these
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45. Which of the following is the most widely used disinfectant in water treatment ?
Chlorine
Irradiation of water by ultraviolet light
Cation exchanger
Coagulation
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