Fuels and Combustion

Question: Largest constituent of coke oven gas is
[A].

N2

[B].

H2

[C].

CH4

[D].

CO2

Answer: Option B

Explanation:

No answer description available for this question.

Question: Largest constituent of blast furnace gas is
[A].

N2

[B].

CO

[C].

CO2

[D].

H2

Answer: Option A

Explanation:

No answer description available for this question.

Question: Yield of blast furnace gas is about __________ Nm3 /ton of pig iron.
[A].

300

[B].

2000

[C].

5000

[D].

10000

Answer: Option B

Explanation:

No answer description available for this question.

Question: With increase in the oxygen content of the coal, its __________ decreases.
[A].

calorific value

[B].

caking power

[C].

both (a) & (b)

[D].

neither (a) nor (b)

Answer: Option C

Explanation:

No answer description available for this question.

Question: Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if
[A].

it contains large amount of volatile matter.

[B].

it is stored in tall heaps.

[C].

smaller fines are stored in large quantity.

[D].

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

Answer: Option D

Explanation:

No answer description available for this question.

Question: Gross and net calorific value of a fuel will be the same
[A].

if its ash content is zero.

[B].

ifits carbon content is very low.

[C].

if its hydrogen/hydrogen compound content is zero.

[D].

under no circumstances.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Calorific value of furnace oil is about __________ Kcal/kg.
[A].

10000

[B].

15000

[C].

5000

[D].

20000

Answer: Option A

Explanation:

No answer description available for this question.

Question: Calorific value of tar is about __________ Kcal/kg.
[A].

8800

[B].

12000

[C].

5000

[D].

16000

Answer: Option A

Explanation:

No answer description available for this question.

Question: Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
[A].

1000

[B].

4000

[C].

6000

[D].

8000

Answer: Option B

Explanation:

No answer description available for this question.

Question: Naphthalene is used for making
[A].

insecticides (e.g. moth balls).

[B].

unsaturated polyesters.

[C].

drug intermediates e.g. β-naphthol.

[D].

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

Answer: Option D

Explanation:

No answer description available for this question.