Workshop Technology
Spot welding is used for welding

Butt joints in plates having thickness above 3 mm
Butt joints in plates having 0.025 mm to 1.25 mm thickness
Lap joints in plates having thickness above 3 mm
Lap joints in plates having 0.025 mm to 1.25 mm thickness

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Workshop Technology
A progressive limit gauge has

None of the listed here
'Go' member at one end and 'Not go' member at the other end
'Go' and 'Not go' member on the same side of the gauge
Separate 'Go' and 'Not go' members

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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 is earthed
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 to the negative terminal

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