Most heavy-duty plasma -are cutting systems require one gas cylinder containing the cutting gas and another containing which of the following? acetylene water vapor shielding or cooling gas a mixture of cutting gas and shielding gas

## Step 1<br />The problem is about the components of a heavy-duty plasma cutting system. These systems typically use a gas cylinder that contains the cutting gas. The question asks for the type of gas that is contained in the second cylinder.<br /><br />## Step 2<br />The options provided are acetylene, water vapor, shielding or cooling gas, and a mixture of cutting gas and shielding gas.<br /><br />## Step 3<br />Acetylene is a type of gas used in welding and cutting processes, but it is not typically used as a shielding or cooling gas.<br /><br />## Step 4<br />Water vapor is not a gas used in plasma cutting systems.<br /><br />## Step 5<br />Shielding or cooling gas is used in plasma cutting systems to protect the metal from the intense heat of the plasma arc and to cool the metal.<br /><br />## Step 6<br />A mixture of cutting gas and shielding gas is not typically used in plasma cutting systems.