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The casting process that does not require a core to produce a hollow casting is?

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The casting process that does not require a core to produce a hollow casting is?

(a) Shell moulding

(b) Hot-chamber die casting

(c) Permanent mould casting

(d) True centrifugal casting

The question was posed to me in my homework.

The question is from Special Casting Techniques in portion Special Casting Techniques of Casting-Forming-Welding I

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Right answer is (c) Permanent mould casting

For explanation: Permanent mould casting is the only process that does not require cores to be used for hollow projections.

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