Fuels and Combustion

Question: ‘Mixed gas’ used in steel plants is a mixture of
[A].

B.F. gas and coke oven gas.

[B].

coke oven gas and converter gas.

[C].

coke oven gas and L.P.G.

[D].

blast furnace gas and naphtha vapor.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the
[A].

hot scarfing of steel slabs.

[B].

mixing with blast furnace gas.

[C].

coke oven battery heating.

[D].

steel ladle drying.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.
[A].

5

[B].

25

[C].

55

[D].

75

Answer: Option B

Explanation:

No answer description available for this question.

Question: Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about
[A].

8800 kcal/m3

[B].

8800 kcal/kg

[C].

same as that of coal middling

[D].

25000 kcal/kg

Answer: Option B

Explanation:

No answer description available for this question.

Question: Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.
[A].

15 to 25

[B].

35 to 45

[C].

55 to 75

[D].

75

Answer: Option B

Explanation:

No answer description available for this question.

Question: Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is
[A].

200 °F

[B].

200 °C

[C].

200 °K

[D].

200 °R

Answer: Option A

Explanation:

No answer description available for this question.

Question: Coke made in narrower by-product coke ovens (as compared to wider ovens) is
[A].

less reactive

[B].

stronger

[C].

smaller in size

[D].

all (a), (b) & (c)

Answer: Option D

Explanation:

No answer description available for this question.

Question: Flue gas from the heating chamber of byproduct coke ovens is removed by
[A].

forced draft fan

[B].

induced draft fan

[C].

steam ejector

[D].

natural draft

Answer: Option D

Explanation:

No answer description available for this question.

Question: In low temperature carbonisation (as compared to high temperature carbonisation) of coal
[A].

ammonia yield is more.

[B].

aliphatic tar is produced.

[C].

free carbon in tar is more.

[D].

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

Answer: Option B

Explanation:

No answer description available for this question.

Question: Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has
[A].

higher calorific value.

[B].

lower hydrogen content.

[C].

both (a) and (b).

[D].

neither (a) nor (b).

Answer: Option D

Explanation:

No answer description available for this question.