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Which of the following problems arises in die casting that can be solved by having vacuum die casting?

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Which of the following problems arises in die casting that can be solved by having vacuum die casting?

(a) Overheating

(b) Interruption in progressive solidification

(c) Air in the cavity

(d) Difficulty in cooling of casting

I got this question in an online quiz.

I would like to ask this question from Vacuum Die Casting in chapter Special Casting Techniques of Casting-Forming-Welding I

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The correct option is (c) Air in the cavity

Easy explanation: The major problem with die casting is the air left in the cavity after closing of die. Since the air cannot escape out so it remains inside the casting. This result in the generation of blisters, which basically appears on the surface of the castings, when the casting is heat treated. This problem can be solved by implementing a vacuum die casting method.

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