Workshop Technology
The current in electric resistance welding can be regulated by

Changing the primary turns of the transformer
Changing the secondary turns of the transformer
Any one of the listed here
Varying the input supply

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Workshop Technology
In permanent mould casting method

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

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