Workshop Technology
The metal extrusion process is generally used for producing

Uniform solid and hollow sections
Uniform hollow sections
Uniform solid sections
Varying solid and hollow sections

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Workshop Technology
In permanent mould casting method

Molten metal is forced into mould under high pressure
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
None of these
Molten metal is poured and allowed to solidify while the mould is revolving

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