Q1: Current employed in resistance welding ranges from __________ kVA/cm² .

ANS:D - 10.5 to 15.5

The correct range for the current employed in resistance welding is typically between 4.5 to 6.2 kVA/cm2, not 10.5 to 15.5 kVA/cm2. Resistance welding is a process that joins materials by applying pressure and passing current through the materials to generate heat, causing them to fuse together. The current density, expressed in kilovolt-amperes per square centimeter (kVA/cm2), is an important parameter in resistance welding. This current density is typically maintained within the range of 4.5 to 6.2 kVA/cm2 for effective welding operations. Using a current density within this range ensures that sufficient heat is generated to soften the materials being welded without causing excessive damage or deformation to the workpieces. It also helps to achieve consistent and reliable welds across various materials and thicknesses. Therefore, the correct range for the current employed in resistance welding is 4.5 to 6.2 kVA/cm2, not 10.5 to 15.5 kVA/cm2.