Chemical Engineering - Fuels and Combustion

21. 

The calorific value of 'LPG' (50% propane + 50% butane) is about __________ kcal/Nm3.

A. 5000
B. 25, 000
C. 10, 000
D. 15, 000

Answer: Option B

Explanation:

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22. 

Washing of coal decreases its

A. caking index.
B. mineral matter content.
C. ash content.
D. both (b) and (c).

Answer: Option B

Explanation:

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23. 

Which of the following petrographic constituents of coal is non-coking ?

A. Vitrain
B. Clarain
C. Durain
D. Fussain

Answer: Option D

Explanation:

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24. 

__________ has the widest inflammability limit (explosion limit) of all the gases.

A. Hydrogen
B. Carbon monoxide
C. Acetylene
D. Methane

Answer: Option C

Explanation:

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25. 

Percentage of methane in coke oven gas may be around

A. 5
B. 15
C. 25
D. 50

Answer: Option C

Explanation:

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