Workshop Technology
In piercing operation, the clearance is provided on

Die
Either on punch or die depending upon designer's choice
Punch
Half on the punch and half on the die

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

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

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