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Which of the following devices is used for the mixing or complete formation of the shell sand mixture?

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Which of the following devices is used for the mixing or complete formation of the shell sand mixture?

(a) Chucker

(b) Mueller

(c) Semi circular roller

(d) Semi cylindrical roller

I had been asked this question during an interview.

This interesting question is from Shell Moulding topic in chapter Special Casting Techniques of Casting-Forming-Welding I

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The correct option is (b) Mueller

The best I can explain: Sand, hexa and additives, which are all dry, are mixed inside a Mueller for a period of 1 minute, then the liquid resin is added and mixing is done for another 3 minutes. Then by introducing cold or warm air into the Mueller, mixing is continued till all the liquid is removed from the mixture and coating of the grains is achieved to the desired degree.

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