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Chemical Engineering - Fuels and Combustion

Exercise : Fuels and Combustion - Section 9
16.
A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO2. It means that
21% excess air has been used for combustion.
21% excess oxygen has been used for combustion.
complete combustion of fuel has taken place.
no excess air has been used for combustion.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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.
1100
1250
1350
1400
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
Light oil whose major component is benzol, is obtained by the distillation of crude tar in the temperature range of __________ °C.
80-170
200-300
250-270
280-300
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
Pick out the wrong statement.
Main constituents of LPG are propane and butane.
C.V. of natural gas is about 10000 KCal/Nm3.
C.V. of LPG is about 26000 kcal/Nm3(11500 kcal/kg).
L.P.G. is lighter than air.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
With increase in C/H ratio of a fuel, the dew point of flue gases
increases
decreases
remains same
may increase or decrease ; depends on the type of fuel
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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