Chemical Engineering - Fuels and Combustion

21. 

Which of the following is not a by-product fuel?

A. Producer gas
B. Blast furnace gas
C. Coke oven gas
D. Refinery gas

Answer: Option A

Explanation:

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22. 

Lignite is

A. a high rank coal.
B. a coking coal.
C. can be used for gasification and steam generation.
D. a black banded coal which burns with a non-smoky yellowish flame.

Answer: Option C

Explanation:

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23. 

Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent.

A. 80 and 97
B. 95 and 100
C. 40 and 70
D. 25 and 97

Answer: Option A

Explanation:

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24. 

Naphthalene recovered from coke oven gas is used

A. as moisture proof coating on fibres.
B. as moth balls (insecticides).
C. as a fuel in furnaces.
D. for making electrodes.

Answer: Option B

Explanation:

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25. 

Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called

A. back draughting.
B. banking.
C. under pressurising.
D. none of these.

Answer: Option B

Explanation:

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