Workshop Technology
For welding plates of thickness more than 12.5 mm, its edges

Do not require bevelling
Should have a double-V or U-groove on both sides
Should be bevelled to a single-V or U-groove
Should have a double-V or U-groove on one side

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Workshop Technology
A progressive limit gauge has

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

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