Particulate Control Devices Questions and Answers

Q: Wet scrubber is used to treat pollution of :

A wet scrubber treats air pollution.In a wet scrubber the polluted gas stream is brought into contact with a scrubbing liquid, usually water or an alkaline solution, by spraying, bubbling or passing through packing. Particles are captured in the droplets and soluble gases such as sulphur dioxide, hydrogen chloride and ammonia are absorbed, so it controls both particulate and gaseous emissions from stacks.It produces wastewater rather than treating it, and it has nothing to do with soil remediation or noise control.

Q: Electrostatic precipitators work on the principle of :

Electrostatic precipitators work on the principle of charge separation.In an electrostatic precipitator the dust-laden gas passes between discharge electrodes held at a high negative voltage and earthed collecting plates. The corona discharge charges the particles, which are then attracted to and held on the collecting plates, from which they are rapped off into hoppers. Removal efficiencies above 99 per cent are achieved for fine fly ash from power plants.Gravity settling chambers and cyclones (centrifugal separation) are different devices that work on other principles, so 'all of the above' is wrong.

Q: Which of the following is not used for removal of particulate pollutants ?

The device not used for particulate removal is the Incinerator.An incinerator burns waste at high temperature to reduce its volume and destroy organic and infectious matter. It produces flue gas and particulates rather than removing them, and itself needs dust control devices on its stack.The other three are standard particulate control equipment. An electrostatic precipitator charges particles and collects them on plates, a bag filter (baghouse) traps them on fabric, and a cyclone throws heavier particles out of a spinning gas stream by centrifugal force.

Q: Which air pollution control equipment works on the principle of centrifugal separation ?

The cyclone works by centrifugal separation.In a cyclone separator, dusty gas enters tangentially and spirals down the cylinder. The heavier particles are thrown outward by the centrifugal force onto the wall, slide down into a hopper, and the cleaned gas leaves upward through the central outlet. It suits coarse particles above about 10 µm.An electrostatic precipitator charges particles and collects them on plates by electric force. A wet scrubber captures them in liquid droplets, and a bag filter traps them by filtration through fabric.

101.

Wet scrubber is used to treat pollution of :

A.Water
B.Air
C.Soil
D.Noise

Exam Year(s)

MH SET - 2018, SET Exam - 2018,

Answer: B

A wet scrubber treats air pollution.

In a wet scrubber the polluted gas stream is brought into contact with a scrubbing liquid, usually water or an alkaline solution, by spraying, bubbling or passing through packing. Particles are captured in the droplets and soluble gases such as sulphur dioxide, hydrogen chloride and ammonia are absorbed, so it controls both particulate and gaseous emissions from stacks.

It produces wastewater rather than treating it, and it has nothing to do with soil remediation or noise control.

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102.

Electrostatic precipitators work on the principle of :

A.Gravity settling
B.Centrifugal separation
C.Charge separation
D.All of the above

Exam Year(s)

MH SET - 2020, SET Exam - 2020,

Answer: C

Electrostatic precipitators work on the principle of charge separation.

In an electrostatic precipitator the dust-laden gas passes between discharge electrodes held at a high negative voltage and earthed collecting plates. The corona discharge charges the particles, which are then attracted to and held on the collecting plates, from which they are rapped off into hoppers. Removal efficiencies above 99 per cent are achieved for fine fly ash from power plants.

Gravity settling chambers and cyclones (centrifugal separation) are different devices that work on other principles, so 'all of the above' is wrong.

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103.

Which of the following is not used for removal of particulate pollutants ?

A.Electrostatic precipitator
B.Bag filter
C.Incinerator
D.Cyclone

Exam Year(s)

MH SET - 2021, SET Exam - 2021,

Answer: C

The device not used for particulate removal is the Incinerator.

An incinerator burns waste at high temperature to reduce its volume and destroy organic and infectious matter. It produces flue gas and particulates rather than removing them, and itself needs dust control devices on its stack.

The other three are standard particulate control equipment. An electrostatic precipitator charges particles and collects them on plates, a bag filter (baghouse) traps them on fabric, and a cyclone throws heavier particles out of a spinning gas stream by centrifugal force.

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104.

Which air pollution control equipment works on the principle of centrifugal separation ?

A.Electrostatic precipitation
B.Cyclone
C.Wet scrubber
D.Bag filter

Exam Year(s)

MH SET - 2023, SET Exam - 2023,

Answer: B

The cyclone works by centrifugal separation.

In a cyclone separator, dusty gas enters tangentially and spirals down the cylinder. The heavier particles are thrown outward by the centrifugal force onto the wall, slide down into a hopper, and the cleaned gas leaves upward through the central outlet. It suits coarse particles above about 10 µm.

An electrostatic precipitator charges particles and collects them on plates by electric force. A wet scrubber captures them in liquid droplets, and a bag filter traps them by filtration through fabric.

Discuss in Forum

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