Fuels and Combustion

Question: Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher
[A].

calorific value

[B].

higher C/H ratio

[C].

sulphur content

[D].

difference in gross & net calorific value

Answer: Option B

Explanation:

No answer description available for this question.

Question: Coal tar fuel – 200 (CTF 200) is a mixture of
[A].

pitch and creosote oil.

[B].

light oil and pitch.

[C].

anthracene and crecosote oil.

[D].

solar oil and pitch.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Naphthalene recovered from coke oven gas is used
[A].

as moisture proof coating on fibres.

[B].

as moth balls (insecticides).

[C].

as a fuel in furnaces.

[D].

for making electrodes.

Answer: Option B

Explanation:

No answer description available for this question.

Question: In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less.
[A].

difference in gross & net calorific value of the coke oven gas

[B].

free carbon content in tar

[C].

yield percentage of coke

[D].

yield of ammonia present in coke oven gas

Answer: Option A

Explanation:

No answer description available for this question.

Question: Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker.
[A].

1100

[B].

1250

[C].

1350

[D].

1400

Answer: Option A

Explanation:

No answer description available for this question.

Question: Coals used for the generation of producer gas should have
[A].

high caking index.

[B].

low fusion point of ash.

[C].

high volatile matter content.

[D].

very low ash content (8-10%).

Answer: Option C

Explanation:

No answer description available for this question.

Question: Hard coke is manufactured from
[A].

lignite

[B].

bituminous coal

[C].

semi-anthracite

[D].

anthracite

Answer: Option B

Explanation:

No answer description available for this question.

Question: Main constituent of the gas produced from a gobar gas plant is
[A].

CO2

[B].

CH4

[C].

H2

[D].

CO

Answer: Option B

Explanation:

No answer description available for this question.

Question: Gobar gas is produced by the __________ of cown dung.
[A].

fermentation

[B].

oxidation

[C].

hydrogenation

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Calorific values of both the solid as well as the liquid fuels can be determined by __________ calorimeter.
[A].

bomb

[B].

Boy’s

[C].

Junkar’s

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.