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Applied Chemistry 2: Fuels & Combustion
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Applied Chemistry 2: Fuels & Combustion
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25 Questions

1. Which of the following is the most reactive (as regards the formation of CO + H2 from C + H2O) ?
2. Presence of free moisture in coal during its high temperature carbonisation
3. Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.
4. Higher percentage of ash in coal meant for the production of metallurgical grade coke
5. Higher efficiency in the combustion of solid fuel can not be achieved by
6. Which of the following is not used as a binder in coal briquetting ?
7. In high temperature carbonisation of coal compared to low temperature carbonisation
8. In presence of which gas is the fuel burnt to generate energy in the form of heat?
9. Ratio of primary air to secondary air increases with increase in the rank of coal, because the
10. Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
11. Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because
12. Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm3 /ton of dry coal.
13. Which of the following gaseous fuels has the lowest calorific value ?
14. Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.
15. Why is ‘make-up water' added to drum continuously?
16. Which of the following is not a by-product recovered in a high temperature coal carbonisation plant ?
17. Carbon Content by weight in air dried wood may be about __________ percent.
18. On what basis is the coal classified?
19. Combustion reaction of fuels is a/an __________ reaction.
20. Wobbe index' is a characteristic of
21. Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.
22. Which of the following constituents of coal is the most important in the production of coke?
23. Junker's calorimeter is used to determine the calorific value of
24. Stack heat losses can be minimised by
25. Coke oven gas consists mainly of

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