Workshop Technology
The instrument which has all the features of try-square, bevel protractor, rule and scriber, is

Combination set
Inside micrometer
Outside micrometer
Depth gauge micrometer

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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 negative terminal and the electrode holder to the positive terminal
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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