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In which type of burning process of solid propellants usually a solid grain is used?

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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 burn

This 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

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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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