<prompt> Double based smokeless gun powder consists ofNitrocellulose plus nitroglycerineNitrocellulose plus sulphurPotassium nitrate plus nitroglycerinePotassium nitrate plus charcoal  <response>: Ans. a. Nitrocellulose plus Nitroglycerine Gun-Powder Smokeless Powder Nitrocellulose gun cottondeg Nitrocellulose and Nitroglycerine double basedeg Smoke producing powders Black Powder: It is described in FG, FFG, FFFG and so on depending on the size of the grains. The finer and faster burning grains have more numbers of Fs. It contains PCSdeg Potassium nitrate 75deg Charcoal 15deg Sulphur 10deg0deg Pyrodex: PCS Potassium perchlorate Sodium benzoate, Dicyandiamide, Dextrin wax Semismokeless powder 80 of black and 20 of smokeless powder 