6. The two air pollution control devices that are usually used to remove very fine particles from the flue gas are

1. 1. Cyclone and Venturi Scrubber

   
   
   

   2. Cyclone and Packed Scrubber

   
   
   

   3. Electrostatic Precipitator and Fabric Filter

   
   
   

   4. Settling Chamber and Tray Scrubber

   
   
   

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1. View Hint View Answer Discuss in Forum

   Electrostatic preceptor is the most common to remove fine suspended particles.

   Correct Option: C

   Electrostatic preceptor is the most common to remove fine suspended particles.

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7. Elevation and temperature data for a place are tabulated below.
   
   Based on the above data, lapse rate can be referred as:

1. 1. Super-adiabatic

   
   
   

   2. Neutral

   
   
   

   3. Sub-adiabatic

   
   
   

   4. Inversion

   
   
   

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1. View Hint View Answer Discuss in Forum

   Ambient lapse rate =	21.25 - 15.70	× 1000
   	(444 – 4)

   
   = 12.6°C/km > 9.8ºC/km
   When the ambient lapse rate exceeds the adiabatic lapse rate, the ambient lapse rate is said to be super adiabatic.

   Correct Option: A

   Ambient lapse rate =	21.25 - 15.70	× 1000
   	(444 – 4)

   
   = 12.6°C/km > 9.8ºC/km
   When the ambient lapse rate exceeds the adiabatic lapse rate, the ambient lapse rate is said to be super adiabatic.

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8. Consider four common air pollutants found in urban environments, NO, SO₂, Soot and O₃. Among these which one is the secondary air pollutant?

1. 1. O₃

   
   
   

   2. NO

   
   
   

   3. SO₂

   
   
   

   4. Soot

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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9. Column I	Column II
   P. Coriolis effect	1. Rotation of earth
   Q. Fumigation	2. Lapse rate and vertical temperature profile
   R. Ozone layer	3. Inversion
   S. Maximum mixing depth (mixing height)	4. Dobson

   
   The correct match of Column I with Column II is

1. 1. P-2, Q-1, R-4, S-3

   
   
   

   2. P-2, Q-1, R-3, S-4

   
   
   

   3. P-1, Q-3, R-2, S-4

   
   
   

   4. P-1, Q-3, R-4, S-2

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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10. Particulate matter (fly ash) carried in effluent gases from the furnaces burning fossil fuels are better removed by

1. 1. cotton bag house filter

   
   
   

   2. electrostatic precipitator (ESP)

   
   
   

   3. cyclone

   
   
   

   4. wet scrubber

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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