Final answer:
The type of power supplies for GMAW is constant-voltage constant-potential, while for SMAW it is constant-current drooping arc voltage.
Step-by-step explanation:
The correct answer to the question about the type of power supplies used in GMAW (Gas Metal Arc Welding) and SMAW (Shielded Metal Arc Welding) is a. Constant-voltage constant-potential, constant-current drooping arc voltage. GMAW power supplies are designed to provide a constant voltage, or potential, which is essential for the stable arc and uniform metal transfer characteristics of the process. SMAW power supplies, on the other hand, deliver a constant current with a voltage that drops, or 'droops', as the arc length changes, which is suitable for the stick welding process where the electrode is manually controlled and the arc length varies.