Chemical Engineering - Fuels and Combustion

26. 

Preheating of __________ the flame temperature.

A. the gaseous fuel before combustion decreases
B. combustion air decreases
C. either the fuel or the air or both, increases
D. either the fuel or the air does not affect.

Answer: Option C

Explanation:

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27. 

Which of the following has the highest heat of combustion?

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

Answer: Option D

Explanation:

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28. 

Calorific value of wood gas is about __________ kcal/Nm3.

A. 1500
B. 3300
C. 5400
D. 8500

Answer: Option B

Explanation:

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29. 

Which adsorbant is used for removing sulphur compounds (S Q, H2S, RSH etc.) removal from coke oven gas in by-products recovery plant ?

A. Silica gel
B. Diatomaceous earth
C. Basalt
D. Bog iron (i.e., moist ferric hydroxide)

Answer: Option D

Explanation:

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30. 

Temperature of coke oven gas just before entering into saturator (for recovery of NH3) is about __________ °C.

A. 30
B. 65
C. 120
D. 180

Answer: Option B

Explanation:

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