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Which of the following cannot be counted among the advantages of a crucible?

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in Casting-Forming-Welding II by (119k points)
Which of the following cannot be counted among the advantages of a crucible?

(a) Uniform heating

(b) Low flexibility

(c) Low installation cost

(d) No contamination of charge

This question was addressed to me in a job interview.

The above asked question is from Crucibles in division Metal Furnace and Practice of Casting-Forming-Welding II

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Right choice is (b) Low flexibility

To elaborate: Melting various materials through crucibles is an old process. This process has the advantage of uniform heating and no contamination of charge by the product obtained from combustion. The operation is inexpensive, and the flexibility is high.

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