Listen Insufficient current during short-circuiting transfer causes: (Multiple Choice) Question 31 options: a) spatter. b) stubbing of the electrode. c) undercut. d) slag inclusions. Question 32 (1 point) Listen Pulsed spray transfer involves: (Multiple Choice) Question 32 options: a) the use of low cost carbon dioxide shielding gas b) a power source whose current output changes between a peak value and a background value at a rapid but controllable rate. c) welding at low current and voltage levels with an argon rich (85% minimum) shielding gas. d) the droplet diameter being typically less than the wire diameter. Question 33 (1 point) Listen An example of an inert gas is: (Multiple Choice) Question 33 options: a) oxygen (O2) b) carbon dioxide (CO2) c) ozone (O3) d) helium (He) Question 34 (1 point) Listen Carbon dioxide: (Multiple Choice) Question 34 options: a) causes a stable arc. b) creates shallow penetration. c) is commonly used in short-circuit transfer. d) promotes a smooth bead appearance. Question 35 (1 point) Listen Adding oxygen to the shielding gas mixture: (Multiple Choice) Question 35 options: a) improves arc characteristics and reduces the surface tension of the weld pool. b) lowers the heat input, weld penetration and edge wetting. c) must be over 5% of the gas mixture. d) creates excessive spatter. Question 36 (1 point) Listen Shielding gas mixtures containing 15% or less carbon dioxide (CO2) are used for: (Multiple Choice