In which type of burning process of solid propellants usually a solid grain is used?(a) Progressive burn(b) Digressive burn(c) Neutral burn(d) Natural burnThis question was addressed to me in an interview for job.The doubt is from Inorganic Chemical topic in section Inorganic Chemical Industries of Chemical Technology

In which type of burning process of solid propellants usually a solid

1.	In which type of burning process of solid propellants usually a solid grain is used?(a) Progressive burn(b) Digressive burn(c) Neutral burn(d) Natural burnThis question was addressed to me in an interview for job.The doubt is from Inorganic Chemical topic in section Inorganic Chemical Industries of Chemical Technology
Answer» Correct answer is (b) DIGRESSIVE burn Easiest explanation: In digressive burn of solid propellants usually a solid grain in the SHAPE of a CYLINDER or sphere is used. In progressive burn usually a grain with MULTIPLE perforations or a STAR cut in the centre providing a lot of surface area is used.

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