Generally cylindrical parts produced by powder metallurgy should not have non uniform cross section and a length to diameter ratio exceeding . . . . . . . . . . . . . . .

The ratio of acetylene to oxygen is approximately ................ for neutral flame used in gas welding

In $$DC$$ welding, the straight polarity (electrode negative) results in

For resistance spot welding of $$1.5$$ $$mm$$ thick steel sheets, the current required is of the order