Workshop Technology
The instrument used to measure external and internal diameter of shafts, thickness of parts and depth of holes, is

Outside micrometer
Depth gauge micrometer
Inside micrometer
Vernier caliper

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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 to the negative terminal
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

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