Workshop Technology
The directional solidification in casting can be improved by using

Chills and chaplets
Chills and padding
Chaplets and padding
Chills, chaplets and padding

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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 to the negative terminal
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 negative terminal and the electrode holder is earthed

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