Chemical Engineering

Question: Assam coals suffers mainly from the disadvantage of high __________ content.
[A].

ash

[B].

volatile matter

[C].

sulphur (4-6%)

[D].

moisture

Answer: Option C

Explanation:

No answer description available for this question.

Question: A coal with high ash content
[A].

has higher calorific value.

[B].

is harder and stronger.

[C].

is not subjected to washing.

[D].

has low quantity of mineral matter.

Answer: Option B

Explanation:

No answer description available for this question.

Question: A coal having higher volatile matter content, has lower
[A].

smoking tendency on burning.

[B].

coke oven gas yield on carbonisation.

[C].

chance of catching fire during storage in open space.

[D].

ignition temperature.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Cannel coal and boghead coal are the examples of
[A].

humic coals

[B].

liptobiolites

[C].

sapropelic coals

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Coking coals are invariably
[A].

lignites

[B].

bituminous coals

[C].

semi-anthracites

[D].

anthracites

Answer: Option B

Explanation:

No answer description available for this question.

Question: Yield of charcoal in high temperature carbonisation of wood is about __________ percent.
[A].

10

[B].

25

[C].

50

[D].

75

Answer: Option B

Explanation:

No answer description available for this question.

Question: Carbon Content by weight in air dried wood may be about __________ percent.
[A].

10

[B].

25

[C].

50

[D].

80

Answer: Option C

Explanation:

No answer description available for this question.

Question: C/H ratio is the minimum in case of
[A].

furnace oil

[B].

natural gas

[C].

coal

[D].

naphtha

Answer: Option B

Explanation:

No answer description available for this question.

Question: C/H ratio is the maximum in case of
[A].

coal

[B].

furnace oil

[C].

natural gas

[D].

naphtha

Answer: Option A

Explanation:

No answer description available for this question.

Question: The bright glow of a combustion process is the characteristic of __________ temperature oxidation of coal.
[A].

fast & high

[B].

slow & low

[C].

slow & high

[D].

fast & slow

Answer: Option A

Explanation:

No answer description available for this question.