75) What is the name of heat treatment process where the steel is reheated to a suitable temperature below the critical point (heating) to improve the toughness and ductility?

76) Which heat treatment process is very similar to annealing but the job are allowed to cool in air?

77) What type of test is used for vessels, tanks and pipe containing pressure?

78) What is the NDT method, used to detect surface and subsurface defects on ferrous metals, using iron power?

79) What Non-destructive test is done using coloured dye and fluorescent liquid to find minute cracks?