1. __________ is used as jet engine fuel.
2. Gas yield in the Kopper-Totzek coal gasifier is about __________ Nm³/ton coal (ash = 35%).
3. Coal containing large quantity of __________ are difficult to wash.
4. Gobar gas is produced by the __________ of 'gobar' (cow dung).
5. Preheating of __________ the flame temperature.
6. Gross heating value of coal is __________ the net heating value.
7. Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm3/ton of dry coal.
8. Yield of blast furnace gas is about __________ Nm3/ton of pig iron.
9. Degree of carbonisation of coal during coke making can be roughly judged by the __________ of the coke produced.
10. With increase in moisture content of coal, its
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