Question

1. true or false? the arc welding power source used for gmaw and fcaw produces a constant voltage.

answer:

1. gmaw power sources have a sloping voltage curve. the curve should slope ____ per 100a when carbon dioxide (co₂) gas is used.

a. 4v to 5v
b. 3v to 4v
c. 2v to 3v
d. 1.5v to 2v
answer:

1. which of the following is not a standard drive roll groove design?

a. a - groove.
b. u - groove.
c. v - groove.
d. knurl - groove.
answer:

1. which of the following drive roll designs is used with fcaw electrode wire?

a. a - groove.
b. u - groove.
c. v - groove.

Explanation:

1. In GMAW (Gas - Metal Arc Welding) and FCAW (Flux - Cored Arc Welding), the power source typically produces a constant - voltage characteristic, so the statement is True.
2. When using carbon dioxide ($CO_2$) gas in GMAW, the voltage curve of power sources should slope 3V to 4V per 100A.
3. A - groove is not a standard drive - roll groove design. Standard ones include U - groove, V - groove, and Knurl - groove.
4. U - groove drive - roll designs are commonly used with FCAW electrode wire.

Answer:

1. True
2. B. 3V to 4V
3. A. A - groove
4. B. U - groove