Environmental Engineering

Question: Most efficient and suitable dust removal equipment for removal of flyash from flue gas in a thermal power plant is the
[A].

gravity settling chamber

[B].

cyclone separator

[C].

electrostatic precipitator

[D].

bag filter

Answer: Option C

Explanation:

No answer description available for this question.

Question: Dust collection efficiency of a cyclone separator depends upon its
[A].

diameter.

[B].

inlet gas velocity.

[C].

overall height.

[D].

all (a), (b) & (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes
[A].

paralysis of muscles & loss of appetite.

[B].

nervous depression.

[C].

gastritis & diarrhea.

[D].

all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes
[A].

fading of dyes on textiles.

[B].

corrosion, tarnishing & soiling of metals.

[C].

reduced strength of textiles.

[D].

all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.
[A].

hydrocarbons

[B].

hydrogen flouride

[C].

hydrogen sulphides

[D].

nitrogen dioxide

Answer: Option B

Explanation:

No answer description available for this question.

Question: Persons working in cement plants and limestone quarries are more prone to disease like
[A].

cancer

[B].

asthma

[C].

silicosis

[D].

flourosis (bone disease)

Answer: Option C

Explanation:

No answer description available for this question.

Question: ‘Safe limit’ called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the
[A].

industrial chimney exhaust.

[B].

automobiles exhaust.

[C].

photochemical reaction in polluted atmosphere.

[D].

burning of domestic fuel.

Answer: Option B

Explanation:

No answer description available for this question.

Question: ‘Particulate’ air pollutants are finely divided solids and liquids. Which of the following is not a ‘particulate’ ?
[A].

Dust & mists

[B].

Smoke & fumes

[C].

Photochemical smog & soot

[D].

None of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called
[A].

fumes

[B].

mists

[C].

smoke

[D].

aerosols

Answer: Option D

Explanation:

No answer description available for this question.

Question: Ozone is
[A].

a primary pollutant.

[B].

a secondary pollutant.

[C].

impervious to ultra-violet rays.

[D].

both (b) and (c)

Answer: Option D

Explanation:

No answer description available for this question.