Workshop Technology
A basic shaft is one whose

Lower and upper deviations are zero
Upper deviation is zero
None of the listed here
Lower deviation is zero

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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 to the positive terminal
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

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