Chemical Engineering - Fuels and Combustion

16. 

Which of the following can be made into briquettes without the use of a binder ?

A. lignite
B. Bituminous coal
C. Anthracite coal
D. None of these

Answer: Option A

Explanation:

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17. 

As the equilibrium moisture content of the coal increases, its

A. calorific value increases.
B. swelling number decreases.
C. swelling number increases.
D. bulk density decreases.

Answer: Option B

Explanation:

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18. 

Which of the following is a measure of the agglutinating (i.e., binding) property of coal?

A. Thickness of plastic layer
B. Caking index
C. Swelling index
D. Gray-king index

Answer: Option B

Explanation:

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19. 

During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.

A. density
B. porosity
C. electrical resistivity
D. none of these

Answer: Option A

Explanation:

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20. 

Blast furnace gas burns with a bluish flame, because of the presence of

A. CO
B. CH4
C. CO2
D. S

Answer: Option A

Explanation:

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