Match the items of List $${\rm I}$$ (Equipment) with the items of List $${\rm II}$$ (Process) and select the correct answer using the given codes

The current in Amperes used in resistance spot welding of plain carbon steel sheets ($$1$$ to $$3$$ $$mm$$ thick) lies within the range:

The metal powder used in Thermit welding of steel is:

A $$\phi $$ $$20$$ $$mm$$ through hole is to be drilled in a $$30$$ $$mm$$ thick plate using a double fluted, $${120^ \circ }$$ lip angle drill. The drill tip is at a distance of $$3$$ $$mm$$ from the plate surface when cutting is started and an over travel of $$2$$ $$mm$$ is recommended as a margin to ensure drilling through the full thickness of the plate. If the drill rotates at $$500$$ $$rev/min$$ and the feed per tooth is $$0.01$$ $$mm,$$ the machining time of the operation (in sec) will be