Chemical Engineering - Fuels and Combustion

21. 

Presence of force moisture in coal is most disadvantageous during its

A. transportation and handling
B. washing
C. pulverisation
D. storage

Answer: Option C

Explanation:

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22. 

Tar is a better fuel than furnace oil, because of its

A. higher calorific value.
B. lower sulphur content.
C. higher emissivity (0.8 - 0.9) resulting in higher radiation heat transfer rate.
D. both (a) and (b).

Answer: Option D

Explanation:

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23. 

With increase in moisture content of coal, its

A. calorific value increases.
B. caking properties diminish.
C. swelling during carbonisation becomes excessive.
D. none of these.

Answer: Option B

Explanation:

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24. 

Main constituent of natural gas is

A. CH4 (upto 90%)
B. C2H6
C. C3H8
D. H2

Answer: Option A

Explanation:

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25. 

For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will

A. increase
B. decrease
C. increase or decrease depending on the fuel type
D. not change

Answer: Option B

Explanation:

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