Red Seal Welding Practice Exam

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What should you do with the oxygen cylinder valve?

Open it fully
Close it
Adjust it slightly
Leave it open slightly

The correct answer is: Close it

It is important to keep the oxygen cylinder valve closed when it is not in use to prevent gas leakage and potential hazards. Adjusting it slightly or leaving it open slightly can still result in gas escaping and causing harm. Closing the valve fully is the safest and proper way to handle the oxygen cylinder.