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1. A coal has the following composition by weight C = 75%,O= 23%, 5=1%, N=1% and ash = 5%. Net calorific value of the fuel was found to be 9600.3 kcal/kg. Calculate the %H and GCV. 2. A gaseous fuel has the following composition of volume: H2 = 24%, CH: = 30%; CHs = 11%, CH: = 4.5%, CHs = 2.5%, CO = 6%; CO2 = 8%, O2 = 2% and N2 = 12%. Calculate the (1) air to fuel ratio and (2) volume of dry products of combustion using 40% excess air. 3. A sample of lignite was found to contain 34.55% moisture, 22.91% FC, 7.2% ash, 1.1% Sand 0.57% N with calorific value of 16.45 kJ/kg. Calculate the proximate and ultimate analysis of the sample