Fuels and Combustion

Question: Blast furnace gas is a very poisonous gas because of its predominantly high __________ content.
[A].

H2O

[B].

CO2

[C].

CO

[D].

CH4

Answer: Option C

Explanation:

No answer description available for this question.

Question: Calorific value of of blast furnace gas is around __________ KCal/Nm3.
[A].

850

[B].

1800

[C].

4200

[D].

6500

Answer: Option A

Explanation:

No answer description available for this question.

Question: Calorific value of coke oven gas is around __________ Kcal/Nm3.
[A].

900

[B].

4200

[C].

7500

[D].

2000

Answer: Option B

Explanation:

No answer description available for this question.

Question: A coal that softens and fuses on heating is
[A].

classified

[B].

carbonised

[C].

caking

[D].

non-caking

Answer: Option C

Explanation:

No answer description available for this question.

Question: Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces
[A].

higher amount of methane.

[B].

lower amount of hydrogen.

[C].

both (a) and (b).

[D].

higher amount of both methane and hydrogen.

Answer: Option C

Explanation:

No answer description available for this question.

Question: With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.
[A].

hydrogen

[B].

methane

[C].

unsaturated hydrocarbons

[D].

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

Answer: Option A

Explanation:

No answer description available for this question.

Question: With increases in carbonisation temperature
[A].

coke even gas yield increases.

[B].

tar yield increases.

[C].

hydrogen percentage in the coke oven gas decreases.

[D].

methane percentage in the coke oven gas increases.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Increase in ash content of blast furnace coke
[A].

reduces its consumption in the furnace.

[B].

increases its consumption in the furnace.

[C].

does not affect its consumption in the furnace.

[D].

decreases its hardness and abrasion resistance.

Answer: Option B

Explanation:

No answer description available for this question.

Question: A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon
[A].

is less liable to spontaneous combustion on storage.

[B].

is more difficult to ignite and produces a shorter flame.

[C].

requires smaller combustion space and less secondary air.

[D].

none of these.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Fusion point of coal ash increases with increase in its __________ content.
[A].

iron sulphate

[B].

iron silicate

[C].

lime and magnesia

[D].

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

Answer: Option D

Explanation:

No answer description available for this question.