Workshop Technology
For gas welding, the pressure desired at the welding torch for oxygen is

70 to 280 kN/m²
560 to 840 kN/m²
280 to 560 kN/m²
7 to 103 kN/m²

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Workshop Technology
In permanent mould casting method

Molten metal is poured and allowed to solidify while the mould is revolving
Molten metal is poured in a metallic mould, retained in the mould long enough for the outer skin to solidify and finally mould is turned over to remove molten metal still in molten condition
Molten metal is forced into mould under high pressure
None of these

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Workshop Technology
A progressive limit gauge has

None of the listed here
'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
Separate 'Go' and 'Not go' members

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