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.

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31.
For most industrial electrostatic precipitator installations particledrift velocity which is used to calculate the precipitation efficiency varies from

3 to 8 ft/s

0.1 to 1 ft/s

60 to 80 ft/s

15 to 20 ft/s

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

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

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

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

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

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

39.
Which of the following devices of particulate collection is the least efficient?

Cyclone separator

Electrostatic precipitator

Fabric filter

Wet scrubber

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

42.
The fabric used in a fabric filter is selected on the basis of

Temperature

Chemical resistance

Dust concentration

All of the above

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

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

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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