Q1: Chromium molybdenum steel can not be welded using __________ welding.

ANS:B - electrical resistance

Chromium molybdenum steel can indeed be welded using electrical resistance welding. This method involves passing an electric current through the materials to be welded, generating heat due to electrical resistance at the interface between the materials. This heat causes the materials to fuse together. The answer "Chromium molybdenum steel cannot be welded using electrical resistance welding" is incorrect. Electrical resistance welding methods, such as spot welding, seam welding, and flash welding, are commonly used for welding chromium molybdenum steel. These methods provide controlled heat input, reducing the risk of heat-affected zone issues and preserving the mechanical properties of the steel. Therefore, electrical resistance welding can be a suitable choice for joining chromium molybdenum steel components.