(01 of 02)

ANSWER KEY Paper Code : AS 4246

B.TECH. VIII SEMESTER, CIVIL ENGINEERING BRANCH SUBJECT: ELECTIVE-III : AIR POLLUTION CONTROL ENGINEERING [CE42T05]

SECTION – A

Fill in the blank with suitable answer:

i) The type of plume which may occur during winter nights is inversion / Fumigating

ii) Natural mist particles formed from water vapour in the atmosphere ranges between

500 to 40 µ in size.

iii) The RSPM is also designated as PM10

iv) The size of Oil smoke particles range from 1.0 to 0.03 µ.

v) The device, which can be used to control gaseous as well as particulate pollutants

in the industrial emissions, is known as Spray Tower.

vi) The pair of pollutants is formed due to photochemical reactions is O3 and PAN.

vii) Beta attenuation monitor is a type of device used for sampling of particulate matter

from stack.

viii) High efficiency cyclones are generally considered to be those with body diameters

up to about 0.25 m.

ix) One of the important methods used for odour masking is Superimposing the pleasant

odour.

x) The polluting gas, which is primarily responsible for causing the green house effect

and global warming, is Carbon Di-Oxide.

(02 of 12)

SECTION – B

Differentiate between the primary and secondary air pollutants, and enumerate the various

such pollutants of both the categories.

Ans.

(03 of 12)

Write down the Gaussian distribution equation which is commonly used to predict the

concentration of an air pollutant evolving from a source (factory) at any downwind point

and the location of the maximum pollution.

Ans.:

(04 of 12)

What are the devices used for sampling gases and vapour? Describe any one in detail.

Ans.:

(05 of 12)

ELECTROSTATIC PRECIPITATOR:

(06 of 12)

Discuss the operating problems associated with cyclonic separators.

Ans.:

(07 of 12)

Compare the following:

i) Tangential and Involute inlet for cyclones

ii) Conventional and high efficiency cyclones

Ans) i) Tangential and Involute inlet for cyclones

ii) Conventional and high efficiency cyclones :

(08 of 12)

Write short notes on :

i) Odour masking ii) Smoke-scope iii) Ringelman chart

Ans.: i) Odour Masking :

ii) Smoke-Scope:

(09 of 12)

iii) Ringelman Chart :

(10 of 12)

Briefly describe the recovery systems used for SO2, NOx and HC from the waste gas streams.

Ans.:

(11 of 12)

Discuss the sources of air pollution in the cement industry. Describe the methods to control the

dust in the cement plants.

Ans.:

(12 of 12)

Explain the sources of air pollution and methods of abatement in the thermal power plants.

Ans.: