94) Liquid carburising is done in a heated salt bath. Which one of the following is not a carburising salt?

95) Silver brazing filler rods are composed of

96) Which drill jig is used while drilling small piece parts?

97) Which devices are inserted in a pipe line to permit connections with little change to the position of the pipe?

98) The fuels like wood, paper, cloth, solid materials, etc. come under which class of fire