1. What is 'Autogenous Welding Process"? A. Welding without using filler metal B. Welding using only frictional heat C. Welding with high-pressure application D. Welding using chemical reactions exclusivel 2. Which of the following is NOT a criterion f A. Welding with or without filler material B. Source of energy of welding C. Type of metal joined D. Are and non -are welding 3. What is a key characteristic of resistance A. They require the use of fluxes and filler mete B. They are always manual processes C. They use heavy current for a short time to ge D. They operate without the application of pres. 4. What is a key difference between TIG wel A. PAW uses a carbon electrode instead of tuns B. PAW produces a lower energy density than C. PAW does not require inert gases for shieldi

1. The correct answer is A. Autogenous Welding Process refers to welding without using filler metal. In this process, the weld is formed by the fusion of the base metal itself, without the addition of any external filler material.<br /><br />2. The correct answer is D. The question seems to be incomplete, but based on the given options, it appears to be asking about the criteria for welding. The correct answer is D, as it is not a criterion for welding.<br /><br />3. The correct answer is C. Resistance welding is a type of welding process that uses heavy current for a short time to generate heat and fuse the metal. It does not require the use of fluxes or filler metal, and it is not always a manual process.<br /><br />4. The correct answer is A. TIG welding (Tungsten Inert Gas welding) uses a tungsten electrode to produce the weld, while PAW (Plasma Arc Welding) uses a carbon electrode instead of a tungsten electrode. This is a key difference between TIG and PAW welding processes.