Common Data for Questions 03 & 04: The arc length voltage characteristic of a DC arc is given by the equation V = 24 + 4L where V is the arc voltage and 'L' is the arc length in mm. The static volt ampere characteristic of the power source is approximated by a straight line with no load voltage of 80 volts and the short circuit current of 600 amperes. 03. The optimum (a) 2 mm (c) 4 mm arc length is (b) 3 mm (d) 5 mm 04. The power utilized is (a) 120 W (c) 12 kW (b) 120 kW (d) 12 MW