Workshop Technology
In a unilateral system of tolerance, the tolerance is allowed on

One side of the nominal size
Both sides of the actual size
Both sides of the nominal size
One side of the actual size

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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 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

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