Chemical Engineering - Fuels and Combustion

26. 

Which of the following is not a binder for coal briquetting ?

A. Coal tar
B. Bitumen
C. Molasses
D. None of these

Answer: Option D

Explanation:

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27. 

The liquid used for the washing of coal in an industrial coal washery is a mixture of water and

A. carbon tetrachloride.
B. sand (40%).
C. mineral oil of high viscosity & specific gravity (1.6)
D. none of these.

Answer: Option B

Explanation:

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28. 

Spontaneous combustion of coal on storage results due to

A. inadequate ventilation.
B. low temperature oxidation.
C. storage in large heaps with small surface to volume ratio.
D. all (a), (b)and (c).

Answer: Option D

Explanation:

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29. 

High temperature carbonisation of coal produces

A. inferior coke compared to low temperature carbonisation.
B. less of gases compared to liquid products.
C. large quantity of tar compared to low temperature carbonisation.
D. none of these.

Answer: Option D

Explanation:

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30. 

Which of the following is the most poisonous gas ?

A. Coke oven gas
B. Producer gas
C. Blast furnace gas
D. L.D. converter gas

Answer: Option D

Explanation:

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