Workshop Technology
When the molten metal is fed in the cavity of a metallic mould by gravity, the method of casting is known as

Centrifugal casting method
Slush casting method
Permanent mould casting method
Die casting method

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Workshop Technology
The welding set up is said to have straight polarity, when

Work is connected to the negative terminal and the electrode holder is earthed
Work is connected to the positive terminal and the electrode holder to the negative terminal
Work is connected to the negative terminal and the electrode holder to the positive terminal
Work is connected to the positive terminal and the electrode holder is earthed

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