21. Caking index of the coal blend used for the manufacture of metallurgical coke should be around
22. Height of coke oven is limited (say maximum upto 7 metres) mainly by the
23. Which of the following fuels is generally not used in thermal power plant boiler firing?
24. Bulk density of pulverised coal may be about __________ kg/m3.
25. Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm3.
26. A sooty flame can be made non-luminous by
27. The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen.
28. Coke oven gas burns with an yellowish flame, because of the presence of
29. Blast furnace gas burns with a bluish flame, because of the presence of
30. With increase in C/H ratio of a fuel, the amount of CO2 formed on its complete combustion
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