Environmental Engineering

Question: Main pollutant present in automobile exhaust is
[A].

CO

[B].

CO2

[C].

NO

[D].

hydrocarbons

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following pollutants is not emitted during volcanic eruptions ?
[A].

SO2

[B].

H2S

[C].

CO

[D].

hydrocarbons

Answer: Option D

Explanation:

No answer description available for this question.

Question: Ionisation potential employed in the industrial electrostatic precipitator is of the order of
[A].

30 to 70 kV DC

[B].

30 to 70 kV AC

[C].

230 V AC

[D].

230 V DC

Answer: Option A

Explanation:

No answer description available for this question.

Question: Aerosols present in atmospheric air may be
[A].

positively charged.

[B].

negatively charged.

[C].

neutral.

[D].

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

Answer: Option D

Explanation:

No answer description available for this question.

Question: Operating principle of cyclone separator is based on the action of __________ dust particles.
[A].

diffusion of

[B].

centrifugal force on

[C].

gravitational force on

[D].

electrostatic force on

Answer: Option B

Explanation:

No answer description available for this question.

Question: 80% less than 200 mesh size particles are called
[A].

smoke

[B].

powder

[C].

grit

[D].

aggregates

Answer: Option B

Explanation:

No answer description available for this question.

Question: Carbonaceous particles having size less than 1 μm are called
[A].

grit

[B].

aggregates

[C].

aerosols

[D].

smoke

Answer: Option D

Explanation:

No answer description available for this question.

Question: Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called
[A].

grit

[B].

dust

[C].

powder

[D].

smoke

Answer: Option A

Explanation:

No answer description available for this question.

Question: H2S present in gaseous stream can be removed by adsorption on
[A].

silica gel

[B].

active carbon

[C].

bog iron

[D].

limestone powder

Answer: Option C

Explanation:

No answer description available for this question.

Question: Ethanolamine is an absorbant used for the removal of __________ from air/gas.
[A].

HF

[B].

SO2

[C].

H2S

[D].

both (b) & (c)

Answer: Option D

Explanation:

No answer description available for this question.