Final answer:
In GMA welding, the voltage and amperage are typically set high to ensure proper weld penetration and metal fusion. For the movement of gas, it flows from an area of high pressure to low pressure, which applies to the flow of shielding gas in GMA welding. The Correct answer is A) High, low.
Step-by-step explanation:
In GMA welding, the correct settings for voltage and amperage can affect the quality of the weld. The question asks about the correct settings for voltage and amperage in GMA welding. For GMA welding, the voltage is typically set high and the amperage is set to high as well, to ensure adequate penetration and fusion of the metal. Therefore, the correct answer to the question 'In GMA welding, the voltage is set ___ and the amperage is set ____.' is D) High, high.
As for the pressure of gas in welding processes, gas typically moves from an area of high pressure to an area of low pressure. This concept is fundamental in gas flow and is applicable to GMA welding where shielding gas is used. So, for the question 'Gas moves from an area of pressure to an area of pressure', Therefore, the correct answer is D) high; low.