13. The type of GTAW electrode to be used for a welding operation is specified in __ a. OSHA regulations b. ASTM and ANSI appendices c. SDS/MSDS and NFPA requirements d. WPS or site quality standards

The correct answer is d. WPS or site quality standards.<br /><br />The type of GTAW (Gas Tungsten Arc Welding) electrode to be used for a welding operation is typically specified in Welding Procedure Specifications (WPS) or site quality standards. WPS documents provide detailed instructions and requirements for welding processes, including the selection of appropriate electrodes based on the specific welding application and material being welded. These standards ensure that the welding operation meets the required quality and safety standards.