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High moisture causes what in molding sands?(a) Increase in permeability(b) Decrease in permeability(c) Increase in hardness(d) Increase in strengthThe question was posed to me during a job interview.The doubt is from Testing of Molding Sand topic in section Sand Preparation of Casting-Forming-Welding I

Answer»

Correct ANSWER is (b) Decrease in permeability

Easy explanation: Permeability is basically the magnitude of pores present in the sands and its CAPACITY of moisture it can HOLD. High moisture CONTENT causes a decrease in permeability of the sand and hence causes other problems in it.



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