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What type of feeder is used to supply the coal in ball and race mill?

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What type of feeder is used to supply the coal in ball and race mill?

(a) Ring main feeder

(b) Parallel feeder

(c) Radial feeder

(d) Rotating table feeder

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This interesting question is from Pulverised Mills topic in division Steam Power Plant of Energy Engineering

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The correct option is (d) Rotating table feeder

To explain: The coal is supplied through the rotating table feeder at the upper right to fall on the inner side of the races. The moving balls and races trap coal between them to crush it to powder. Spring holds down the upper stationary race and adjusts the force needed for crushing.

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