The process of making hollow castings
of desired thickness by permanent mould without the use of cores is known as-
Die casting
Slush casting
Pressed casting
Centrifugal casting
Centrifugal casting
The process of making hollow casting of desired thickness by permanent mould without the use of core is known as centrifugal casting.Centrifugal casting techniques that is typically used to cast thin walled cylinders. it is typically used to cast materials such as metals ,glass and concrete. a high quality is attainable by control of metallurgy and crystal structure.
Hence, the correct option is (D).
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