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

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

ANSWER DOWNLOAD EXAMIANS APP

Workshop Technology
Swab is used for

Smoothing and cleaning out depressions in the mould
Moistening the sand around the edge before removing pattern
Reinforcement of sand in the top part of the moulding box
Cleaning the moulding sand

ANSWER DOWNLOAD EXAMIANS APP