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Negative surface irregularities cannot be caused by which of the following factor?

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in Casting-Forming-Welding I by (687k points)
Negative surface irregularities cannot be caused by which of the following factor?

(a) Slag inclusion

(b) Oxidation pitting

(c) Nitride pitting

(d) Shrinkage

The question was posed to me during an online interview.

Question is from Visual Inspection in chapter Inspection Testing in Foundries of Casting-Forming-Welding I

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The correct option is (c) Nitride pitting

Explanation: For the formation of negative surface irregularities, slag and oxide inclusion, oxidation pitting, gas and shrinkage are very important factors, but not nitride pitting, as it does not cause negative surface irregularity.

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