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What does an unbacked core generate?

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in Casting-Forming-Welding I by (687k points)
What does an unbacked core generate?

(a) Greenhouse gases

(b) Mold gases

(c) Mold liquids

(d) Ultraviolet rays

This question was posed to me during a job interview.

My doubt stems from Baking the Cores topic in portion Core and Core Making of Casting-Forming-Welding I

1 Answer

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Best answer
Correct choice is (b) Mold gases

Explanation: An unbacked core causes to generate an excessive amount of mold gases which then produce blowholes in the castings.

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