30) In Electro-chemical Machining, material removal is due to

31) A rectangular bar with a circular hole is to be made of a material with actual maximum permissible stress of 150 Mpa. If stress concentration factor for the configuration is 3.0, what is the nominal average stress for sizing the section?

32) TIG welding is preferred for

33) Which engine requires forward motion through air to produce thrust

34) Which of the following is essential for boiler operation?