Chemical Engineering - Fuels and Combustion

16. 

A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO2. It means that

A. 21% excess air has been used for combustion.
B. 21% excess oxygen has been used for combustion.
C. complete combustion of fuel has taken place.
D. no excess air has been used for combustion.

Answer: Option C

Explanation:

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17. 

Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker.

A. 1100
B. 1250
C. 1350
D. 1400

Answer: Option A

Explanation:

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18. 

Light oil whose major component is benzol, is obtained by the distillation of crude tar in the temperature range of __________ °C.

A. 80-170
B. 200-300
C. 250-270
D. 280-300

Answer: Option A

Explanation:

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19. 

Pick out the wrong statement.

A. Main constituents of LPG are propane and butane.
B. C.V. of natural gas is about 10000 KCal/Nm3.
C. C.V. of LPG is about 26000 kcal/Nm3(11500 kcal/kg).
D. L.P.G. is lighter than air.

Answer: Option D

Explanation:

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20. 

With increase in C/H ratio of a fuel, the dew point of flue gases

A. increases
B. decreases
C. remains same
D. may increase or decrease ; depends on the type of fuel

Answer: Option B

Explanation:

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