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

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

ANSWER DOWNLOAD EXAMIANS APP

Workshop Technology
The purpose of a riser is to

Deliver molten metal into the mould cavity
Feed the molten metal to the casting in order to compensate for the shrinkage
Deliver the molten metal from pouring basin to gate
Act as a reservoir for the molten metal

ANSWER DOWNLOAD EXAMIANS APP