Chemical Engineering - Fuels and Combustion

31. 

Which of the following has the highest flame velocity ?

A. H2
B. CO
C. CH4
D. C2H6

Answer: Option A

Explanation:

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32. 

Which of the following constituents of a fuel does not contribute to its calorific value on combustion ?

A. Hydrogen
B. Sulphur
C. Carbon
D. None of these

Answer: Option D

Explanation:

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33. 

Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces

A. higher amount of methane.
B. lower amount of hydrogen.
C. both (a) and (b).
D. higher amount of both methane and hydrogen.

Answer: Option C

Explanation:

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34. 

For long flame and easy ignition, the coal used should have

A. high volatile matter
B. low ash
C. high calorific value
D. high ash

Answer: Option A

Explanation:

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35. 

Which of the following has the highest calorific value (kcal/Nm3) ?

A. Carburetted water gas
B. Gobar gas
C. Natural gas
D. LPG

Answer: Option D

Explanation:

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