Workshop Technology
In a centrifugal casting method

Core is made of nonferrous metal
No core is used
Core is made of sand
Core is made of ferrous metal

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Workshop Technology
In permanent mould casting method

None of these
Molten metal is poured in a metallic mould, retained in the mould long enough for the outer skin to solidify and finally mould is turned over to remove molten metal still in molten condition
Molten metal is forced into mould under high pressure
Molten metal is poured and allowed to solidify while the mould is revolving

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