GATE Mechanical Engineering (ME) 2012 Solved Paper

In a DC arc welding operation, the voltage-arc length characteristic was obtained as V_arc = 20 + 5L where the arc length I was varied between 5 mm and 7 mm. Here V_arc, denotes the arc voltage in Volts. The arc current was varied from 400 A to 500 A. Assuming linear power source characteristic, the open circuit voltage and short circuit current for the welding operation are: