For the brake shown in the figure, which one of the following is TRUE?

The welding process which uses a blanket of fusible granular flux is

Gray cast iron blocks of size $$100\,\,mm \times 50\,\,mm \times 10\,\,mm$$ with a central spherical cavity of diameter $$4$$ mm are sand cast. The shrinkage allowance for the pattern is $$3\% $$. The ratio of the volume of the pattern to volume of the casting is ___________________

The value of true strain produced in compressing a cylinder to half its original length is